Komatsu condensed the whole working life of two compact hydraulic excavators into 287 pages, and this Komatsu PC45MR-3, PC55MR-3 operator manual PDF, factory document TEN00553-00, reproduces all of it, from the morning walk-around to long term storage. The maintenance schedule chart maps every interval from 100 to 2000 service-meter hours, backed by the procedures themselves: oil and coolant handling, electrical system care, hydraulic precautions, and a full wear parts list. Gauge and monitoring system explanations tell you what the panel is actually reporting, and dedicated chapters cover traveling on slopes, escaping mud, trailer loading, lifting points, and cold weather starts. Pack the swing pinion case with 4.5 liters of grease; swap rubber shoes once lug height wears to 5 mm. Sometimes it is just you, the machine, nobody to ask. Print the section you need and let it get greasy on the bench; the bookmarked file stays clean.
What's Inside This Komatsu PC45MR-3, PC55MR-3 Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 14-55 | Safety Labels (Location of Safety Labels), Safety Machine Operation (Transportation, Battery, Towing, Lifting Objects with Bucket), Safety Maintenance Information |
| Machine View and Controls | 56-64 | Overall Machine View, Monitoring System, Gauges, Service Meter |
| Switches and Control Levers | 65-72 | Starting Switch, Lamp Switch, Cab Heater, Control Levers, Blade Control |
| Machine Operation and Handling | 73-81 | Travel Levers, Boom Swing Pedal, Windshield Operation, Emergency Escape, Komtrax |
| Engine and Daily Checks | 82-97 | Engine Rear Cover, Tilting Floor, Walk-Around Checks, Coolant Level, Fuel Level |
| Operating Procedures | 98-123 | Starting Engine, Warming-Up, Stopping Engine, Traveling, Traveling on Slopes |
| Work Applications and Transportation | 124-157 | Steering, Swinging, Backhoe Work, Loading, Parking, Transportation, Lifting |
| Cold Weather and Long Term Storage | 158-171 | Cold Weather Operation, Battery, Long Term Storage, Troubleshooting |
| Maintenance | 172-241 | Maintenance Information, Outline of Service (Handling Oil, Fuel, Coolant, And Performing Oil Clinic, Electric System Maintenance, Handling Hydraulic System), Wear Parts (List) |
| Specifications | 242-245 | Engine, Operating Weight, Bucket Capacity, Working Ranges, Travel Speed, Swing Speed |
| Attachments and Options | 246-283 | Attachments and Options - General Information (Safety First, Attachment Installation, Bucket with Hook, Hook Condition, Prohibited Operations) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Tightening torque for 6mm bolt | 11.8-14.7 Nm | p. 184 |
| Tightening torque for 8mm bolt | 27-34 Nm | p. 184 |
| Rubber shoe lug height replacement limit | 5 mm | p. 209 |
| Rubber shoe crack repair threshold | 60 mm | p. 210 |
| Total amount of grease for swing pinion | 4.5 liters (4.1 kg) [1.19 US gal, 9.04 lb] | p. 220 |
| Engine Oil Pan Capacity | 8.1 L | p. 182 |
| Hydraulic System Capacity | 55 L | p. 182 |
| Fuel Tank Capacity | 65 L | p. 182 |
| Cooling System Capacity | 8.5 L | p. 182 |
| Engine Oil Filter Replacement Interval | 500 hours | p. 180 |
| PC45MR-3 | ||
| Operating Weight (Canopy) | 4,795 kg | p. 243 |
| PC55MR-3 | ||
| Operating Weight (Canopy) | 5,160 kg | p. 243 |
Komatsu PC45MR-3, PC55MR-3 Common Problems This Manual Covers
Komatsu PC45MR-3 one track weaker than the other after hydraulic oil warms up, machine pulls sideways
Check track tension before blaming the travel motors. Measure rubber shoe deflection; it should be 1 to 3 mm per page 211, and set both sides equal. Warm the machine fully, then test travel on flat ground. If one side still lags with tension matched, have your Komatsu dealer test the travel circuit.
Manual Section: Maintenance p. 211Coolant temperature gauge climbs into the red zone during heavy digging on hot days
Stop work and run the engine at low idle until the gauge drops, then shut down and let it cool. Check coolant level in the reserve tank during walk-around checks on page 82. Top up if low; cooling system capacity is 8.5 L per page 182. Clean debris from the radiator fins with compressed air.
Manual Section: Engine and Daily Checks p. 82Engine cranks slowly and refuses to fire on cold mornings below freezing
Check battery charge and terminal condition first; cold weather kills a weak battery fast. Follow the cold weather operation steps starting on page 158, including proper warm-up. Verify you are running winter-grade fuel and the correct oil viscosity when refilling the 8.1 L oil pan per page 182. Charge or replace the battery if cranking stays slow.
Manual Section: Cold Weather and Long Term Storage p. 158Rubber track lugs worn smooth and cracks spreading between the lugs on both tracks
Measure lug height first; if less than 5 mm, replace the shoe per page 209. Inspect cracks between the lugs: repair anything near 60 mm, but cracks under 30 mm long or 10 mm deep can wait, per page 210. Keep tension set to 1 to 3 mm deflection so loose tracks do not chew themselves up.
Manual Section: Maintenance p. 209Whining noise from the hydraulic pump and jerky boom movement right after startup
Check hydraulic oil level with the machine on flat ground and attachments lowered; low oil lets the pump suck air and whine. Top up as needed; system capacity is 55 L per page 182. Run the full warm-up procedure starting on page 98 before loading the hydraulics. Replace the hydraulic oil filter every 1000 hours per page 180.
Manual Section: Maintenance p. 182Frequently Asked Questions
What is the tightening torque for the track shoe bolts on the PC45MR-3 and PC55MR-3?
The track shoe bolts should first be tightened to a torque of 137 ± 19.6 Nm (14 ± 2 kgm, 101.3 ± 14.5 lbft). After this initial tightening, they must be tightened a further 90° ± 10°. p. 202
What is the tightening torque for hydraulic hose joint screws on the Komatsu PC45MR-3, PC55MR-3?
The tightening torque for hydraulic hose joint screws depends on the nominal size. For example, 9/16-18UNF screws have a target torque of 44 Nm (4.5 kgm, 32.5 lbft), while 13/16-12UN screws have a target torque of 216 Nm (22.0 kgm, 159.1 lbft). p. 184
What is the standard deflection for the cooling fan belt?
The standard deflection for the cooling fan belt is approximately 9 to 13 mm (0.355 to 0.5 in) when pressed with a finger force of approximately 98 N (10 kg) at a point midway between the crankshaft and fan pulleys. p. 230
What is the capacity of the engine oil pan for the PC45MR-3 and PC55MR-3?
The engine oil pan has a capacity of 8.1 liters (2.14 US gal), with a refill capacity of 7.5 liters (1.98 US gal). p. 182
How often should the hydraulic oil filter element be replaced?
The hydraulic oil filter element should be replaced every 1000 hours of operation. p. 180
Is this Komatsu PC45MR-3 manual a PDF I download?
Delivery is instant: a 287-page searchable PDF is yours the second checkout clears. Laptop, tablet, or phone, all fine.
Is this Komatsu PC45MR-3 Operator Manual printable?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
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