The maintenance section is the heart of this 385-page Komatsu PC88MR-8 operator manual PDF (OEM ID PEN00288-00), carrying the hydraulic excavator's service schedule from the check before starting to the 5000-hour interval, plus a tightening torque list, wear parts list and lubricant chart. Around that, the book walks you through the machine monitor and working mode selector, travel on slopes, escape from mud, trailer loading, lifting the machine, cold weather operation and long-term storage. Attachments get their own chapter: breaker and crusher operation, quick coupler piping, extra counterweight installation and track shoe selection. Refill the swing machinery case with 2.8 liters (0.74 US gal), and hold shop air to 0.69 MPa (99.4 PSI) or less when you clean the outer air cleaner element. A made-up drain plug torque strips threads or leaves oil weeping. The file is bookmarked and text-searchable, and it prints clean, so the maintenance pages can live on your bench and take the grease.
What's Inside This Komatsu PC88MR-8 Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 16-61 | Safety Labels, General Precautions Common to Operation and Maintenance, Precautions for Operation, Precautions for Maintenance |
| Machine View Illustrations and Controls | 62-87 | Overall Machine View, Machine Monitor, Monitoring System, Working Mode Selector, Auto-Deceleration Switch |
| Detailed Controls and Gauges | 88-124 | Travel Speed Selector, Wiper Switch, Air Conditioner Controls, Function Switches, Clock Adjustment, Economy Mode Adjustment |
| Machine Operations and Controls | 125-168 | Starting Switch, Fuel Control Dial, Control Levers and Pedals, Sun Roof, Windshield, Sliding Door, Emergency Escape Hammer |
| Machine Operation Procedures | 169-212 | Walk-Around Checks, Starting Engine, Moving the Machine, Steering, Swinging, Working Mode Selection |
| Prohibited Operations and General Information | 213-244 | Prohibited Operations, Traveling on Slopes, Escape From Mud, Recommended Applications, Bucket Replacement, Attachment Operations |
| Transportation and Lifting | 245-271 | Transportation Procedure, Loading and Unloading with Trailer, Lifting Machine, Komtrax System |
| Maintenance | 272-272 | |
| Maintenance Information | 273-287 | Outline of Service (Handling Oil, Fuel, Coolant, And Performing Oil Clinic, Electric System Maintenance), Wear Parts (List), Recommended Fuel |
| Maintenance Procedure | 288-355 | |
| Specifications | 356-359 | Operating Weight, Engine Horsepower, Travel Speed, Digging Reach, Digging Depth, Dumping Height |
| Attachments and Options | 360-381 | Attachments and Options - General Information (Safety First, Attachment Installation, Bucket with Hook) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Maximum compressed air pressure for cleaning outer element | 0.69 MPa (7 kg/cm2, 99.4 PSI) | p. 289 |
| Shim thickness | 0.5 mm (0.020 in) | p. 309 |
| Breaker circuit additional oil filter case tightening torque | 58.8 to 78.5 Nm (6 to 8 kgm, 43.4 to 57.9 lbft) | p. 313 |
| Swing machinery case oil refill capacity | 2.8 liters (0.74 US gal) | p. 341 |
| Drain plug (P) tightening torque | 44 to 93 Nm (4.5 to 9.5 kgm, 32.5 to 68.7 lbft) | p. 341 |
| Engine Oil Pan Refill Capacity | 11.0 Liters | p. 281 |
| Hydraulic System Refill Capacity | 56 Liters | p. 281 |
| Fuel Tank Capacity | 125 Liters | p. 281 |
| Cooling System Capacity | 10 Liters | p. 281 |
| Track Shoe Bolt Tightening Torque (Steel Shoe) | 118 ± 19.6 Nm (First), 90° ± 10° (Second) | p. 295 |
| Track Shoe Bolt Tightening Torque (Road Liner) | 196 ± 19.6 Nm | p. 295 |
| Standard Track Deflection | 10 to 30 mm | p. 296 |
Komatsu PC88MR-8 Common Problems This Manual Covers
Komatsu PC88MR-8 charge monitor or engine oil pressure monitor lights up on the machine monitor while running
Check the electrical troubleshooting table on page 266, which lists causes and remedies for the charge monitor and oil pressure monitor. Verify engine oil level before restarting; the oil pan refill capacity is 11.0 liters per page 281. Do not keep working the machine with either monitor lit until the cause is found.
Manual Section: Electrical System Troubleshooting p. 266Steel shoe track tension out of adjustment, track visibly sagging or running too tight
Measure track deflection following page 296 and compare it against the standard 10 to 30 mm. Adjust tension until it falls inside that range; rubber shoes run 1 to 3 mm per page 300. Check steel shoe bolts and torque loose ones to 118 ± 19.6 Nm plus 90° ± 10°, as page 295 specifies.
Manual Section: Maintenance p. 296Engine overheating with steam from the radiator and water temperature running high
Check coolant level only after the engine has cooled down. Work through the engine troubleshooting table covering steam from the radiator and high water temperature. Refill with the recommended coolant listed in the maintenance section; total cooling system capacity is 10 liters per page 281. If steam returns after topping up, park the machine until the cause is found.
Manual Section: Engine TroubleshootingHydraulic oil temperature running high or boom, arm, and bucket speed noticeably slow
Check hydraulic oil level and top up as needed; the hydraulic system refill capacity is 56 liters per page 281. Verify the working mode selector setting before chasing a hydraulic fault. Then work through the chassis troubleshooting table for high hydraulic oil temperature and slow boom, arm, and bucket speed.
Manual Section: Chassis TroubleshootingAir cleaner outer element visibly clogged with dust at the daily walk-around check
Remove the outer element and clean it with compressed air, keeping pressure at or below 0.69 MPa (7 kg/cm2, 99.4 PSI) as page 289 specifies. Inspect the element before refitting and replace it if damaged. Follow the maintenance schedule for cleaning and replacement intervals.
Manual Section: Maintenance p. 289Engine will not start after the machine ran out of fuel on the job
Fill the fuel tank first; capacity is 125 liters per page 281. Bleed air from the fuel system following the running out of fuel procedure under Troubles and Actions before cranking again. If the engine still refuses to start, work through the engine troubleshooting table for start failure.
Manual Section: Troubles and Actions (Running out of fuel)Frequently Asked Questions
What are the torque specifications for the track shoe bolts on the PC88MR-8?
For steel shoes, first tighten the bolts to 118 ± 19.6 Nm (12 ± 2 kgm, 86.8 ± 14.5 lbft), then tighten a further 90° ± 10°. For road liners, tighten to a torque of 196 ± 19.6 Nm (20 ± 2 kgm, 144.7 ± 14.5 lbft). p. 295
How do I reset the maintenance interval on the machine monitor?
On the maintenance list screen, press and hold switch F6 for at least 1.5 seconds to access the reset screen. Follow the prompts on the reconfirmation screen and press F6 again to reset the remaining time. p. 96
What is the standard deflection for the cooling fan belt?
The standard deflection for the cooling fan belt is 9-13 mm (0.4-0.5 in) when pressed with a force of approximately 58.8 N (6 kg) at the midpoint between the alternator and crankshaft pulleys. p. 328
What is the hydraulic tank refill capacity on the Komatsu PC88MR-8?
The refill capacity for the hydraulic tank is 56 liters (14.8 US gal). p. 353
What is the procedure for bleeding air from the hydraulic pump?
Loosen the air bleed plug (1) on the pump drain port until oil oozes out, indicating air is bled. After completion, tighten the plug securely. p. 318
Is this Komatsu PC88MR-8 Operator Manual a digital download?
A single searchable PDF file of 385 pages, downloadable right after payment. Nothing ships, nothing waits in the mail.
Is this Komatsu PC88MR-8 manual print-friendly?
Yes. It prints from any PDF reader, so run off the pages you need for your own repair work.
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