1. Nature of Industrial Equipment Maintenance Disputes

A typical industrial maintenance arrangement may involve:

1. Preventive maintenance – scheduled inspections, lubrication, replacement of wear parts and servicing.
2. Corrective maintenance – repair after breakdown.
3. Predictive/condition-based maintenance – maintenance based on vibration, temperature, pressure, sensor or diagnostic data.
4. Breakdown maintenance – emergency restoration following equipment failure.
5. Annual maintenance contracts (AMC).
6. Comprehensive maintenance contracts (CMC).
7. Long-term O&M contracts.
8. OEM maintenance agreements.
9. Performance-based maintenance contracts.
10. Turnkey supply + installation + commissioning + maintenance arrangements.

A recent Indian example demonstrates how the characterization of such agreements can itself become contentious. In NTPC Ltd. v. Union of India (2026), the dispute concerned a long-term contract for maintenance of equipment at a coal-handling plant, with disagreement over whether the arrangement was essentially a service contract or a composite works contract. 

2. Common Causes of Disputes

A. Failure to maintain equipment properly

The owner may allege that the contractor failed to:

• perform scheduled inspections;
• replace defective components;
• maintain lubrication schedules;
• calibrate equipment;
• conduct testing;
• maintain maintenance logs;
• respond to breakdown calls;
• comply with OEM instructions.

The contractor may respond that the failure was caused by:

• improper operation;
• excessive loading;
• poor-quality raw material;
• voltage fluctuation;
• environmental conditions;
• lack of spare parts supplied by the owner;
• operator negligence;
• inherent manufacturing defects.

The central question becomes:

What caused the failure, and which party contractually assumed that risk?

3. Preventive Maintenance vs Corrective Maintenance

The distinction is legally significant.

Preventive maintenance

The contractor must undertake maintenance before failure occurs.

For example:

• replacing bearings every 10,000 operating hours;
• changing filters;
• testing electrical insulation;
• inspecting turbine blades;
• calibrating pressure sensors.

Failure to undertake scheduled preventive maintenance can constitute contractual breach even where the machine has not yet failed.

Corrective maintenance

This arises after a defect or breakdown occurs.

The dispute may concern whether the contractor:

• responded within the contractual response time;
• supplied spare parts;
• restored operation within the prescribed period;
• used qualified personnel;
• properly diagnosed the defect.

4. Availability Guarantees

Large industrial maintenance contracts frequently contain an availability guarantee.

For example:

The contractor shall maintain 98% annual equipment availability.

If the equipment remains unavailable for 30 days, the owner may claim:

• service credits;
• liquidated damages;
• additional maintenance costs;
• replacement equipment costs;
• loss of production;
• termination.

But the contractor may argue that certain downtime must be excluded.

Typical exclusions include:

• force majeure;
• planned shutdown;
• owner-caused downtime;
• grid failure;
• shortage of owner-supplied materials;
• operation outside design parameters.

Therefore, downtime accounting becomes a major evidentiary issue.

5. Performance Guarantee Disputes

Maintenance contracts sometimes go beyond mere repair.

The contractor may guarantee:

• production capacity;
• fuel efficiency;
• thermal efficiency;
• power output;
• operating hours;
• equipment availability;
• mean time between failures (MTBF);
• mean time to repair (MTTR).

A failure to achieve the guaranteed level may give rise to damages or liquidated damages.

A particularly relevant Supreme Court decision is Sahakarmaharshi Bhausaheb Thorat Sahakari Sakhar Karkhana Ltd. v. ThyssenKrupp Industries India Pvt. Ltd. (2025), concerning plant and machinery, guaranteed performance, delay, short production and performance-related claims. The dispute illustrates how contractual performance guarantees and agreed liquidated-damages mechanisms can control the remedies available for machinery underperformance.

6. Repair Does Not Necessarily Mean Successful Maintenance

A contractor cannot necessarily defend a maintenance claim merely by proving that its engineers attended the machine.

The legally relevant questions may be:

• Was the underlying defect correctly diagnosed?
• Was the repair technically adequate?
• Were appropriate replacement parts used?
• Was the equipment returned to contractual performance?
• Did the same defect recur?
• Was the contractor obliged to provide a permanent solution rather than temporary repair?

Consequently, maintenance records, service reports, photographs, sensor data and failure histories become extremely important evidence.

7. Allocation of Responsibility for Spare Parts

Many disputes concern who bears the cost of replacement parts.

A contract may provide:

Labour is included in the annual maintenance fee, but major replacement parts shall be separately chargeable.

Disputes can then arise over whether a component constitutes:

• ordinary consumable;
• wear-and-tear item;
• major spare;
• capital replacement;
• defective component;
• warranty item.

The tribunal will ordinarily examine the contractual definitions rather than simply rely upon the label given by either party.

8. OEM Warranty and Maintenance Contractor Liability

Industrial equipment may involve three parties:

Manufacturer → Owner → Maintenance Contractor

A defect may originate with the manufacturer, while the maintenance contractor may be responsible for servicing.

This creates questions such as:

• Is the maintenance contractor liable for manufacturing defects?
• Must it identify latent defects?
• Does maintenance preserve the manufacturer's warranty?
• Can the owner sue both parties?
• Is the contractor required to use OEM parts?
• Who bears consequential damage?

The contractual allocation of risk becomes critical.

9. Operation and Maintenance Contracts Can Be Interconnected

The distinction between an equipment contract and a maintenance agreement is not always artificial.

In Vishal Malleables Ltd. v. Bharat Heavy Electricals Ltd., the Madras High Court considered an arrangement involving equipment supply and subsequent operation and maintenance obligations. The Court treated the O&M obligation as connected with the original machinery arrangement rather than automatically treating it as an entirely independent transaction.

This is important because a party cannot necessarily avoid contractual liability by arguing:

"The original equipment contract is over; the later maintenance agreement is a completely separate transaction."

The contractual structure and commercial relationship must be examined.

10. Particularly Relevant Case Laws

Below are eight cases that are useful for analysing industrial equipment maintenance disputes.

Case 1: NTPC Ltd. v. Union of India — 2026

This is particularly relevant because it directly involved a long-term contract for maintenance of coal-handling plant equipment.

The dispute included the characterization of the maintenance arrangement as a service contract versus a composite works contract. The contractual structure involved BOQ-based maintenance work and an arbitration mechanism.

Principle

The legal character of a maintenance agreement is determined by its substance, contractual obligations and actual scope, not merely its title.

Relevance

This is important where parties dispute whether an industrial maintenance arrangement falls within:

• service-contract legislation;
• MSMED legislation;
• works-contract provisions;
• procurement regulations;
• arbitration provisions.

Case 2: Sahakarmaharshi Bhausaheb Thorat Sahakari Sakhar Karkhana Ltd. v. ThyssenKrupp Industries India Pvt. Ltd. — Supreme Court, 2025

This case involved industrial plant and machinery and disputes concerning:

• delay in supply;
• guaranteed performance;
• short production;
• machinery performance;
• liquidated damages;
• refund and consequential financial claims.

The claimant had sought substantial damages based upon machinery performance and production losses.

Principle

Where the contract establishes specific performance guarantees and liquidated-damages mechanisms, the tribunal must examine the contractual remedial structure carefully rather than automatically award every consequential loss alleged by the owner.

Maintenance relevance

This reasoning is directly applicable where an O&M contractor guarantees:

• machine output;
• availability;
• efficiency;
• production;
• energy consumption.

Case 3: Inox Air Products Ltd. v. Rathi Ispat Ltd. — Supreme Court

This is a highly useful case concerning plant and equipment lease agreements combined with operation and maintenance agreements.

The parties had separate agreements relating to plant and equipment and O&M obligations, each containing arbitration provisions. The Supreme Court referred disputes concerning both the lease arrangements and O&M agreements to arbitration.

Principle

Where equipment leasing and O&M obligations form part of an integrated commercial arrangement, disputes arising from the interconnected agreements can be dealt with together through arbitration where the contractual framework permits.

Maintenance relevance

This is particularly important for:

• leased machinery;
• captive power equipment;
• industrial gas plants;
• generators;
• production machinery;
• equipment-as-a-service arrangements.

Case 4: Rathi Ispat Ltd. v. Inox Air Products Ltd. — Delhi High Court, 2019

The subsequent litigation concerned disputes arising from the plant and equipment lease and operation and maintenance agreements.

The court records that the arbitral reference covered claims and counterclaims arising from both the lease agreements and O&M agreements.

Principle

A maintenance dispute cannot necessarily be examined in isolation where the maintenance obligation is commercially and contractually integrated with:

• equipment leasing;
• operation;
• possession;
• payment obligations;
• termination.

Practical significance

When drafting an O&M contract, the arbitration clause should expressly cover:

supply, installation, commissioning, operation, maintenance, repair, replacement, warranty and termination disputes.

Case 5: Venlon Metallising Pvt. Ltd. v. Dev Power Corporation — Madras High Court

This case concerned a contract for leasing, operating and maintaining modular power-generation equipment.

The equipment included multiple generator sets, and the dispute arose after equipment failures and disagreement concerning continued operation and maintenance. An arbitral award addressed access to the equipment, operation and maintenance rights, fixed charges and damages.

Principle

An O&M contractor's entitlement to payment and damages can depend upon the contractual allocation of:

• equipment access;
• operation rights;
• maintenance responsibility;
• fixed charges;
• output;
• contract duration.

Practical significance

Where the owner prevents the maintenance contractor from accessing machinery, the owner may itself be exposed to contractual consequences.

Conversely, a contractor that voluntarily abandons maintenance may face claims for breach.

Case 6: Dodsal Engineering & Construction Co. v. Voltas Ltd.

This case involved a pump station package, including design, engineering, manufacture, testing and supply, with associated installation, commissioning and operation/maintenance arrangements.

The contractual documentation included an arbitration clause concerning disputes relating to performance and contractual rights and liabilities.

Principle

Industrial equipment contracts frequently consist of several interconnected obligations:

Design → Manufacture → Supply → Installation → Commissioning → Operation → Maintenance

A dispute concerning maintenance may therefore require examination of the original equipment specifications and commissioning obligations.

Practical significance

A maintenance contractor may argue:

"The equipment was defective from manufacture."

The owner may respond:

"The defect resulted from inadequate maintenance."

Expert evidence may therefore be necessary to establish causation.

Case 7: ACME Manufacturing Company Ltd. v. Union of India

This dispute involved industrial machinery/equipment that allegedly failed to achieve the required performance and production capacity.

The equipment was rejected after defects affected its ability to operate according to the contractual requirements, leading to arbitration and claims for recovery.

Principle

Where industrial equipment does not satisfy contractual performance specifications, the contractual consequences depend upon:

• acceptance testing;
• performance guarantees;
• contractual specifications;
• defects;
• commissioning;
• rejection rights;
• replacement obligations.

Maintenance relevance

The case is useful when the dispute is framed as:

Was the equipment inherently defective, or did inadequate maintenance cause the failure?

Case 8: TBS India Telematic & Biomedical Services (P) Ltd. v. Commissioner of Health & Family Welfare

This case involved a contract for service and maintenance of biomedical assets and equipment.

The dispute arose from a maintenance agreement under which the contractor provided equipment maintenance, repair and associated services. Payment disputes subsequently developed and arbitration proceedings were sought.

Principle

Maintenance contracts are capable of generating ordinary contractual and arbitration disputes involving:

• unpaid invoices;
• service obligations;
• repair responsibilities;
• termination;
• performance;
• contractual interpretation.

Practical significance

The case is particularly useful by analogy for maintenance agreements covering large inventories of industrial equipment.

11. Contractual Liability Under the Indian Contract Act

Several provisions of the Indian Contract Act, 1872 are particularly relevant.

Section 37 — Obligation to perform

Parties must perform their contractual promises unless performance is legally excused.

For a maintenance contractor this may mean:

• attending breakdowns;
• undertaking scheduled maintenance;
• providing qualified engineers;
• supplying contractual spare parts;
• maintaining equipment at specified performance levels.

Section 39 — Refusal to perform

If a contractor fundamentally refuses to perform its maintenance obligations, the owner may potentially treat the contract as repudiated, subject to the facts and contractual provisions.

Section 55 — Time-bound obligations

Where maintenance response or repair time is expressly made contractual, delay may become legally significant.

Examples:

• response within 2 hours;
• engineer deployment within 6 hours;
• repair within 24 hours;
• restoration within 48 hours.

Section 73 — Compensation

The owner may seek compensation for loss caused by breach, subject to the rules of remoteness, causation and proof.

Potential claims include:

• additional repair expenditure;
• replacement maintenance cost;
• reasonable emergency procurement costs;
• proven production losses;
• equipment restoration expenses.

Section 74 — Liquidated damages

Maintenance contracts commonly contain:

• downtime damages;
• availability damages;
• SLA penalties;
• delay damages;
• performance deductions.

Section 74 becomes relevant where the contract specifies an amount payable for breach.

The Supreme Court's machinery-performance jurisprudence, including Sahakarmaharshi Bhausaheb Thorat, demonstrates the importance of analysing agreed contractual damages alongside the actual performance obligation.

12. Loss of Production and Consequential Damages

This is one of the most contentious areas.

Suppose a maintenance failure causes a production line to stop for ten days.

The owner may claim:

₹10 crore loss of production.

The contractor may argue:

"The contract excludes consequential losses."

The tribunal will examine:

1. contractual exclusion clause;
2. causation;
3. foreseeability;
4. evidence of actual production loss;
5. alternative production capacity;
6. mitigation;
7. contractual limitation of liability;
8. whether the loss is direct or consequential.

A claim based merely on theoretical production capacity is usually much weaker than a claim supported by:

• production records;
• historical output;
• sales orders;
• customer contracts;
• plant utilisation data;
• maintenance logs;
• financial statements.

13. Duty to Mitigate

The owner cannot necessarily allow losses to accumulate indefinitely.

Suppose a machine fails because of an alleged maintenance breach.

The owner may be expected to consider reasonable measures such as:

• emergency repair;
• alternative machinery;
• temporary outsourcing;
• replacement components;
• alternate production lines.

The additional reasonable expenditure may itself become a recoverable head of damage, depending upon the contract and proof.

14. Evidence in Equipment Maintenance Arbitration

Industrial maintenance disputes are heavily evidence-driven.

The most important evidence often includes:

Technical documents

• equipment manuals;
• OEM specifications;
• maintenance schedules;
• inspection reports;
• commissioning certificates;
• warranty documents;
• service reports;
• failure analysis reports.

Digital evidence

• SCADA records;
• PLC logs;
• vibration-monitoring data;
• temperature records;
• IoT sensor information;
• machine operating-hours data;
• alarm history;
• predictive-maintenance software records.

Contractual evidence

• AMC;
• O&M agreement;
• purchase order;
• technical specification;
• SLA;
• BOQ;
• warranty;
• change orders;
• correspondence.

Financial evidence

• repair invoices;
• replacement-part invoices;
• production reports;
• downtime calculations;
• loss-of-profit calculations;
• maintenance expenditure.

15. Causation Is Usually the Central Issue

Consider a failed industrial compressor.

The owner says:

"The contractor failed to replace the bearing."

The contractor says:

"The compressor was overloaded."

The manufacturer says:

"The bearing was defective."

Three potential causes therefore exist:

Maintenance failure → Overloading → Manufacturing defect

An arbitral tribunal will generally need expert evidence to determine which causal explanation is supported by the technical record.

16. Role of Expert Evidence

Industrial equipment disputes often require experts in:

• mechanical engineering;
• electrical engineering;
• turbine engineering;
• metallurgy;
• vibration analysis;
• reliability engineering;
• process engineering;
• industrial automation.

The expert should ideally establish:

Failure → Root cause → Contractual responsibility → Consequence → Cost

A technically impressive expert report is not sufficient if it fails to connect the engineering conclusion to the contractual obligation.

17. Maintenance Logs Can Become Critical Evidence

Suppose the contract requires monthly preventive maintenance.

The contractor produces a maintenance log showing:

"Inspection completed — machine satisfactory."

But sensor data shows:

excessive vibration for three weeks before breakdown.

The tribunal may question the reliability of the maintenance records.

Conversely, if the contractor warned:

"Bearing vibration exceeds acceptable limit; replacement recommended."

and the owner refused replacement, the contractor may have a strong defence.

Thus, written warnings are extremely important.

18. Owner's Operational Negligence

The contractor is not automatically responsible for every equipment failure.

Potential owner-side breaches include:

• operating machinery beyond rated capacity;
• unauthorized modifications;
• poor lubrication;
• use of unsuitable fuel;
• improper voltage;
• contaminated process fluids;
• untrained operators;
• failure to provide shutdown windows;
• refusal to approve replacement parts.

A properly drafted O&M contract should therefore contain an explicit owner responsibility matrix.

19. Contractor's Liability for Negligent Maintenance

Conversely, a contractor may be liable where it:

• ignores repeated alarms;
• fails to conduct inspections;
• uses counterfeit/non-conforming parts;
• employs unqualified technicians;
• falsifies maintenance reports;
• fails to follow OEM instructions;
• misses scheduled overhaul;
• improperly reassembles machinery.

The contractual SLA should make these obligations measurable.

20. Termination of Maintenance Contracts

A maintenance contract may be terminated because of:

• repeated breakdowns;
• failure to meet availability;
• persistent SLA violations;
• non-payment;
• refusal to provide personnel;
• safety violations;
• abandonment;
• insolvency.

Before termination, the contract may require:

1. notice of breach;
2. cure period;
3. corrective action plan;
4. escalation;
5. independent inspection;
6. final termination notice.

Failure to follow these requirements may itself generate a dispute.

21. Arbitration of Industrial Maintenance Disputes

Industrial O&M agreements are particularly suitable for arbitration because they often involve:

• technically complex facts;
• confidential manufacturing information;
• high-value contracts;
• international OEMs;
• expert evidence;
• cross-border supply chains.

A good arbitration clause should cover disputes arising from:

"design, manufacture, supply, installation, commissioning, operation, maintenance, repair, replacement, warranty, performance, availability, breakdown, termination and payment."

This avoids arguments over whether a particular maintenance dispute falls within the arbitration clause.

22. Limitation of Liability

A sophisticated O&M contract normally contains a liability structure such as:

Annual contract value → Liability cap → Exceptions

For example:

Contractor's aggregate liability shall not exceed 100% of annual maintenance fees.

But exceptions may apply to:

• death or personal injury;
• fraud;
• wilful misconduct;
• gross negligence;
• confidentiality breaches;
• intellectual-property infringement;
• environmental damage.

The interpretation of such clauses can substantially affect the value of an arbitration claim.

23. Force Majeure and Equipment Failure

A contractor may attempt to invoke force majeure where failure results from:

• natural disaster;
• war;
• government restrictions;
• extraordinary supply-chain disruption;
• embargo;
• catastrophic external events.

However, ordinary:

• component failure;
• poor planning;
• shortage of technicians;
• lack of spare parts;
• predictable wear and tear

will not automatically constitute force majeure.

The contractual definition is therefore crucial.

24. Warranty vs Maintenance Liability

A machine may simultaneously be covered by:

Manufacturer warranty + Maintenance contract

This creates difficult questions.

For example:

A turbine bearing fails six months after installation.

Was the cause:

• manufacturing defect?
• installation defect?
• maintenance failure?
• ordinary wear?
• improper operation?

The contract should specify which party must investigate and how warranty claims are coordinated.

25. Key Issues an Arbitral Tribunal Will Determine

An industrial equipment maintenance arbitration may ultimately involve the following questions:

26. Practical Model of an Industrial Maintenance Dispute

Consider a factory with a ₹100 crore production line.

The maintenance contractor agrees to:

• 98% annual availability;
• 2-hour emergency response;
• 24-hour repair target;
• preventive maintenance every 1,000 operating hours;
• OEM-compliant spare parts.

A major gearbox fails.

The owner alleges:

• preventive maintenance was skipped;
• vibration warnings were ignored;
• non-OEM bearings were installed;
• 12 days of production were lost.

The contractor argues:

• the machine was overloaded;
• the owner ignored previous warnings;
• the failure was caused by an inherent gearbox defect;
• the contract excludes loss of profits.

An arbitration would likely proceed through:

Contract interpretation → Technical investigation → Expert evidence → Causation → Contractual responsibility → Damages → Limitation of liability.

That sequence is often more important than the mere fact that the machine broke down.

27. Key Lessons from the Case Law

The cases collectively demonstrate several important principles.

1. Substance of the maintenance arrangement matters

N TPC Ltd. v. Union of India demonstrates the importance of determining the actual legal nature of a long-term equipment-maintenance arrangement rather than relying solely on its title.

2. O&M obligations can be integrated with equipment contracts

Inox Air Products and Rathi Ispat illustrate the close relationship between equipment leasing and O&M obligations.

3. Equipment performance guarantees are contractually significant

Sahakarmaharshi Bhausaheb Thorat demonstrates the importance of contractual performance guarantees, machinery performance and agreed damages mechanisms.

4. Access to equipment matters

Venlon Metallising illustrates how access, possession, operation and maintenance rights can directly affect the parties' contractual liabilities.

5. Equipment supply and maintenance may form one commercial relationship

Dodsal Engineering demonstrates the interconnected nature of design, supply, commissioning and O&M obligations.

6. Maintenance contracts can independently generate arbitrable commercial disputes

TBS India Telematic & Biomedical Services illustrates disputes involving equipment maintenance, payments, termination and arbitration.

28. Best Drafting Practices for Industrial Maintenance Contracts

To prevent disputes, an O&M contract should clearly specify:

Technical scope

• equipment covered;
• components covered;
• exclusions;
• maintenance frequency.

Performance

• availability;
• efficiency;
• output;
• MTBF;
• MTTR.

Response

• emergency response time;
• engineer mobilisation;
• restoration period.

Spare parts

• OEM requirement;
• consumables;
• major components;
• cost allocation.

Responsibility matrix

• owner responsibilities;
• contractor responsibilities;
• manufacturer responsibilities.

Evidence

• maintenance logs;
• sensor records;
• inspection certificates;
• failure reports.

Damages

• liquidated damages;
• service credits;
• loss-of-production treatment;
• liability cap.

Termination

• material breach;
• cure period;
• repeated SLA failure;
• safety breach.

Dispute resolution

• arbitration;
• seat;
• governing law;
• number of arbitrators;
• technical expert mechanism.

Conclusion

Industrial equipment maintenance disputes are fundamentally disputes about risk allocation, technical causation and contractual performance. A machine failure by itself does not establish maintenance-contract liability. The claimant normally needs to demonstrate the contractual obligation, breach, causal connection and recoverable loss, while the contractor may rely upon owner misuse, excluded events, inherent defects, force majeure, contractual limitations or failure to mitigate.

The most important lesson from the Indian case law is that an industrial maintenance dispute should not be treated merely as a "repair dispute." It may simultaneously involve equipment supply, commissioning, warranty, O&M, performance guarantees, availability obligations, liquidated damages, consequential loss, termination and arbitration.

For high-value industrial projects, the strongest contractual framework is therefore one that creates a clear chain: