A warning lamp comes on mid-shift and nobody in the cab knows whether to keep digging or park it; this Komatsu PC40MR-2, PC50MR-2 operator manual PDF exists for that call: 267 factory pages, OEM ID TEN00054-01, covering both compact hydraulic excavators. Maintenance schedule charts break the work down by the hour meter, from daily walk-around checks through the 500, 1,000, and 2,000 hour services, backed by lubricant specifications and a wear parts list. When something quits, the troubles-and-actions pages walk you through a discharged battery, towing, and running out of fuel, and the monitoring system section decodes every lamp on the panel. Refill the engine with 7.4 liters of oil, keep auxiliary attachment flow at 70 liters per minute at 2,350 rpm, and pull the 8 mm bolts to 27-34 N·m. Guessing buys you the part twice. This bookmarked, text-searchable PDF prints clean, so the pages can go to the bench and take the grease.
What's Inside This Komatsu PC40MR-2, PC50MR-2 Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| Foreword | 1-15 | Safety Information, Product Information, Serial Numbers, Distributor Info |
| Safety | 16-55 | Safety Information, Safety Labels (Location of Safety Labels, Safety Information), Safety Machine Operation (Transportation, Battery, Towing, Lifting Objects with Bucket) |
| Machine View Illustrations and Controls | 56-71 | Machine View, Controls and Gauges, Monitoring System, Switches |
| Machine Operations and Controls | 72-94 | Lock Lever, Work Equipment Control Levers, Fuel Control Lever, Blade Control Lever, Floor Opening Method |
| Before Starting and Starting Engine | 95-112 | Walk-Around Checks, Checks Before Starting, Starting Engine, Starting in Cold Weather |
| Machine Operation and Steering | 113-126 | Warming-Up Operation, Stopping the Engine, Moving the Machine, Steering, Swinging |
| Work Equipment Operations and Prohibited Actions | 127-143 | Prohibited Operations, General Operation Information, Traveling on Slopes, Escape From Mud, Rubber Shoes and Road Liners |
| Transportation and Lifting | 144-153 | Transportation Procedure, Loading and Unloading, Securing the Machine, Lifting the Machine |
| Cold Weather Operation and Long Term Storage | 154-158 | Fuel and Lubricants, Cooling System Coolant, Battery, Cab Heater, Long Term Storage |
| Troubles and Actions | 159-169 | Running Out of Fuel, Towing the Machine, Discharged Battery, Electrical System Troubleshooting, Engine Troubleshooting |
| Maintenance | 170-231 | Maintenance Information, Outline of Service (Handling Oil, Fuel, Coolant, And Performing Oil Clinic, Electric System Maintenance, Handling Hydraulic System), Wear Parts (List) |
| Specifications | 232-235 | Operating Weight, Bucket Capacity, Engine Horsepower, Dimensions, Working Ranges |
| Attachments and Options | 236-263 | Attachments and Options - General Information (Safety First, Attachment Installation, Bucket with Hook, Prohibited Operations) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Tightening torque for 6mm bolt | 11.8-14.7 N·m | p. 183 |
| Tightening torque for 8mm bolt | 27-34 N·m | p. 183 |
| Max. flow (engine speed) - Quick coupler | 70 liter/min (2,350 rpm) | p. 254 |
| Max. flow (engine speed) - Stop valve | 70 liter/min (2,350 rpm) | p. 254 |
| Engine Oil Capacity (Refill) | 7.4L | p. 179 |
| Hydraulic System Capacity (Refill) | 20L | p. 179 |
| Fuel Tank Capacity | 65L | p. 179 |
| Cooling System Capacity | 7.3L | p. 179 |
| Engine Horsepower | 29.4 kW | p. 233 |
| Track Shoe Bolt Tightening Torque | 137 N·m | p. 199 |
| PC40MR-2 | ||
| Operating Weight | 4,790 kg | p. 233 |
| PC50MR-2 | ||
| Operating Weight | 5,040 kg | p. 233 |
Komatsu PC40MR-2, PC50MR-2 Common Problems This Manual Covers
Komatsu PC50MR-2 hydraulics turn slow and weak after 30 minutes of work, swing barely moves
Check the hydraulic oil level with the machine on flat ground and verify you are running the correct viscosity for your ambient temperature, per the maintenance section starting on page 170. If the oil is dark or milky, drain and refill the system; it takes 20L. Then run the warming-up operation on page 113 before loading the machine.
Manual Section: Maintenance p. 170Engine cranks but will not start after the machine ran out of fuel
Fill the fuel tank; it holds 65L. Bleed air from the fuel system using the running-out-of-fuel procedure on page 159. While you are at it, drain any water from the separator and tighten the ring to 14.7 N·m. Crank in short bursts and rest the starter between attempts.
Manual Section: Running Out of Fuel p. 159Engine hard to start on cold mornings and cranks slowly in freezing weather
Check the cold weather starting procedure on page 95 and let the pre-heating cycle finish before cranking. Switch to the fuels and lubricants listed for low temperatures on page 154. If you change engine oil to a winter grade, refill with 7.4L. Keep the battery fully charged; a cold battery loses cranking power fast.
Manual Section: Before Starting and Starting Engine p. 95Track sags and clanks over the idler, machine pulls to one side when traveling
Check track sag between the idler and sprocket with the machine parked on firm, level ground. Adjust tension by adding or releasing grease at the adjuster, following the maintenance section starting on page 170. While you are down there, check every track shoe bolt and torque any loose ones to 137 N·m, listed on page 199.
Manual Section: Maintenance p. 170Coolant temperature gauge climbs into the red zone during heavy digging on hot days
Check the coolant level in the reserve tank during your walk-around on page 95, then run the engine at low idle until the gauge drops; never shut down a hot engine immediately. Clean mud and debris from the radiator fins. If coolant is low, top up slowly; total capacity is 7.3L, shown on page 179.
Manual Section: Before Starting and Starting Engine p. 95Frequently Asked Questions
What is the engine oil capacity for the PC40MR-2 and PC50MR-2?
The specified capacity for the engine oil pan is 8.0 liters (2.11 US gal), and the refill capacity is 7.4 liters (1.96 US gal). p. 179
What is the correct cooling fan belt tension for the engine?
The cooling fan belt tension should be approximately 7 to 10 mm (0.276 to 0.4 in) of deflection when pressed at a point midway between the alternator pulley and the fan pulley with a finger pressure of approximately 98 N (10 kgf). p. 225
How do I bleed the air from the hydraulic system?
To bleed the air from the hydraulic system, loosen the air bleed plug on the piston pump until oil oozes out, then tighten it. After starting the engine, run it at low idle and extend/retract each cylinder 4 to 5 times without reaching the stroke end, then operate to the end of the stroke 3 to 4 times, and finally 4 to 5 times to the end of the stroke. p. 214
What is the tightening torque for the track shoe bolts on the Komatsu PC40MR-2, PC50MR-2?
For the road liner mounting bolts, the tightening torque is 137 ± 19.6 N·m (14 ± 2 kgf·m, 101.3 ± 14.5 lbft). For steel track shoe bolts, first tighten to 137 ± 19.6 N·m (14 ± 2 kgf·m, 101.3 ± 14.5 lbft), then tighten a further 90° ± 10°. p. 199
Will this Komatsu PC40MR-2 Operator Manual download right away?
This is a 267-page searchable PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Does this Komatsu PC40MR-2 manual allow printing?
Zero restrictions. The PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
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