The Komatsu PC75UU-2 operator manual PDF (OEM ID SEAM005600) takes this compact hydraulic excavator from walkaround to shutdown across 219 pages, including transport and cold weather running. Operation fills the largest share of the book: every gauge and warning lamp explained, rubber track handling, trailer loading, escaping from mud, and a list of symptoms that are normal, so you don't hunt for faults that aren't there. Maintenance takes nearly a third, built on a schedule chart from the initial 250-hour service through 4000 hours, plus separate intervals for hydraulic breaker work and a temperature chart for fuel, coolant and oils. Fill the engine oil pan to 9.0 L, and set fan belt deflection at 8 mm (0.3 in) under 6 kg (13 lb) of thumb pressure. A missed grease interval costs you a seized pin. Bookmarked and text-searchable, the PDF prints clean, so the service pages can live on the bench and collect grease.
What's Inside This Komatsu PC75UU-2 Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety Information | 3 | Signal Words, Safety Precautions, Safety Messages, Safety Labels |
| Location of Plates, Table to Enter Serial No. and Distributor | 5-9 | Machine Serial Number Plate, Engine Serial Number Plate, Distributor Information Table |
| Safety | 10-39 | Precautions During Operation (Before Starting Engine, Operating Machine, Transportation) |
| Operation | 40-115 | Check Before Starting Engine, Starting Engine, Operations and Checks After Starting Engine, Moving Machine Off, Steering Machine, Stopping Machine, Swinging |
| Troubleshooting | 116-127 | |
| Maintenance | 128-193 | Guides to Maintenance, Outlines of Service (Outline of Oil, Fuel, Coolant, Relating to Electric System), Wear Parts List, Use of Fuel |
| Specifications | 194-197 | Operating Weight, Bucket Capacity, Travel Speed, Swing Speed, Engine Model, Flywheel Horsepower |
| Option, Attachment | 198-219 | Using Car Radio (Explanation of Parts, Method of Use, Specifications), Using Car Cooler (Control Panel, Precautions When Using, Maintenance of Car Cooler) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Fan belt deflection | 8 mm (0.3 in) | p. 182 |
| Bolt Torque (Thread diameter 6mm) | 13.2 ± 1.4 Nm | p. 142 |
| Bolt Torque (Thread diameter 8mm) | 31.4 ± 2.9 Nm | p. 142 |
| Fan belt adjustment force | 6 kg (13 lb) | p. 182 |
| Engine Oil Pan Capacity (Specified) | 9.0L | p. 137 |
| Hydraulic System Capacity (Specified) | 100L | p. 137 |
| Fuel Tank Capacity (Specified) | 80.0L | p. 137 |
| Cooling System Capacity (Specified) | 9.0L | p. 137 |
| Track Shoe Bolt Tightening Torque | 118 ± 20 Nm | p. 159 |
| Swing Machinery Case Drain Plug Torque | 44.1 - 93.1 Nm | p. 188 |
| Operating Weight (Rubber shoe, cab) | 7750 kg | p. 195 |
| Operating Weight (Steel shoe, cab) | 7850 kg | p. 195 |
Komatsu PC75UU-2 Common Problems This Manual Covers
Komatsu PC75UU-2 excavator travel, swing, boom, arm and bucket functions all running slow
Check the hydraulic oil level and top up to the specified level as shown on page 123. Lack of hydraulic oil is the main listed cause of slow travel, swing and work equipment. Release all internal pressure before adding oil; page 33 warns that the work equipment circuits are always under pressure. If speeds stay slow with a full tank, contact your Komatsu distributor.
Manual Section: Chassis Troubleshooting p. 123Hydraulic oil temperature rising excessively during steady digging, swinging and travel work cycles
Adjust fan belt tension following page 182. The belt should deflect 8 mm (0.3 in) when pressed with 6 kg (13 lb). Keep hands and tools clear of the fan and belt, because page 34 warns that rotating parts can cut off or throw anything they catch. Next, check the hydraulic oil level and add oil to the specified level. Release internal pressure first, as page 33 instructs.
Manual Section: Chassis Troubleshooting p. 123Rubber or steel track repeatedly coming off the undercarriage sprocket during travel
Adjust track tension, because page 123 lists a loose track as the cause. When you loosen the grease drain plug, never turn it more than one turn. Keep your face, hands and feet out of line with the plug, since page 34 warns it can fly out. If the sprocket shows abnormal wear, have your Komatsu distributor deal with it.
Manual Section: Chassis Troubleshooting p. 123Starting motor cranks the engine sluggishly or its pinion keeps going in and out
Check the battery charge and recharge the battery, as page 122 lists low charge as a cause of both symptoms. Stop the engine, turn the key OFF and wear goggles before you touch the battery; page 119 warns that a spark can ignite the hydrogen gas. When removing the battery, disconnect the ground cable first. If cranking stays sluggish on a charged battery, have your Komatsu distributor replace the starting motor.
Manual Section: Electrical System Troubleshooting p. 122Steam blowing from the radiator pressure valve and water temperature gauge in the red range
Check the cooling water level, look for leaks and add water as shown on page 124. Do not remove the radiator cap while the engine is hot, because page 34 warns that opening it in that condition can cause burns. Adjust the fan belt to 8 mm deflection (page 182), clean clogged radiator fins, and tighten the filler cap or replace its packing. Leave thermostat replacement to your Komatsu distributor.
Manual Section: Engine Troubleshooting p. 124Error code 41 on the monitor, swing and all work equipment will not operate
Turn on the cancel switch and move the machine to a safe place. Then have your Komatsu distributor check it right away, as page 126 directs. Code 41 points to the basic pressure lock solenoid valve. If the machine still will not move with the cancel switch on, stop there and call the distributor.
Manual Section: 4-System Troubleshooting p. 126Frequently Asked Questions
What are the torque specifications for bolts and nuts on the Komatsu PC75UU-2?
The tightening torque is determined by the width across the flats of the nut and bolt. For example, a 6mm thread diameter bolt with a 10mm width across flats requires 13.2 Nm (9.73 lbft) of torque, while a 39mm thread diameter bolt with a 60mm width across flats requires 3280 Nm (2420 lbft). p. 142
How do I adjust the track tension on a Komatsu PC75UU-2 equipped with steel shoes?
The standard tension is a clearance of 60-100 mm (2.4-4 in) between the roller surface of the track shoe and the track roller tread at the 3rd track roller from the sprocket. To increase tension, pump grease through the lubricator using a grease pump; to loosen, turn the lubricator a maximum of one turn. p. 157
What is the procedure for clearing error code 61 on the 4-system?
Error code 61 indicates an abnormality in the automatic stop position. If the cancel switch is used to move the bucket to the front or to the right, the self-diagnosis is canceled and it becomes possible to operate the machine again, but the machine must be checked immediately. p. 126
What is the engine oil capacity for the PC75UU-2 engine oil pan?
The specified engine oil capacity for the engine oil pan is 9.0 liters (2.4 US gal, 2.0 UK gal), with a refill capacity of 7.5 liters (2.0 US gal, 1.7 UK gal). p. 137
How often should the fuel filter cartridge be replaced?
The fuel filter cartridge should be replaced every 500 hours of operation. p. 136
What do I get after purchasing this Komatsu PC75UU-2 manual?
All 219 pages arrive as one searchable PDF at checkout. Read it at the desk, then take the phone out to the machine.
Can I print specific sections of this Komatsu PC75UU-2 Operator Manual?
You can. Print the sections you want for your own use and keep the file as your backup.
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