The Komatsu PC50UU-2 operator manual PDF, factory publication SEAM005500, spells out across 228 pages how this hydraulic excavator should be started, worked, transported, and stored. Operation claims the largest share of the book: machine monitor readouts, lock levers and swing lock, the 4-System interference prevention device with its depth, height, and offset modes, plus rubber shoe handling and loading procedures. A maintenance schedule chart maps every service on your machine from the initial 250 hours out to the 2000-hour jobs, and troubleshooting pages walk through towing, discharged batteries, and 4-System error codes. Refill the hydraulic system with 36.0 liters, the engine oil pan with 8.7, and change the hydraulic filter element every 250 hours once past break-in. One torque figure pulled from memory shears studs. This bookmarked, keyword-searchable file also holds the wear parts list, so your next parts order lands on the right number the first time.
What's Inside This Komatsu PC50UU-2 Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety Information | 3 | Signal Words, Safety Precautions, Potential Hazards, Safety Labels |
| Location of Plates, Table to Enter Serial No. and Distributor | 5-10 | Machine Serial Number Plate, Engine Serial Number Plate, Serial Number Entry Table, Distributor Information |
| Safety | 11-38 | Precautions During Operation (Before Starting Engine, Operating Machine, Transportation, Battery, Towing, Before Carrying Out Maintenance, During Maintenance) |
| General View and Explanation of Components | 39-51 | General View of Machine, Controls and Gauges, Machine Monitor, Switches, Control Levers and Pedals |
| Operation Procedures and Checks | 52-75 | Lock Levers, Swing Lock, Starting Engine, Warming Up, Interference Prevention Device |
| Moving and Steering the Machine | 76-86 | Moving Forward, Moving Backward, Steering, Stopping, Traveling on Slopes |
| Work Applications and Parking | 87-94 | Backhoe Work, Ditching, Loading, Smoothing, Parking, Replacing Bucket |
| Handling 4-System and Automatic Control | 95-104 | Interference Prevention, Depth Display, Depth Mode, Height Mode, Offset Mode |
| Handling Rubber Shoes and Transportation | 105-115 | Rubber Shoe Maintenance, Loading and Unloading, Lifting Chassis, Transportation Precautions |
| Cold Weather and Long-Term Storage | 116-121 | Cold Weather Fuel and Lubricants, Battery Maintenance, Long-Term Storage Procedures |
| Troubleshooting | 122-134 | Non-Failure Phenomena, Towing, Battery Discharge, Electrical System Troubleshooting, 4-System Error Codes |
| Maintenance | 135-200 | Guides to Maintenance, Outlines of Service (Outline of Oil, Fuel, Coolant, Relating to Electric System), Wear Parts List, Use of Fuel |
| Specifications | 201-204 | Operating Weight, Bucket Capacity, Travel Speed, Swing Speed, Engine Model, Flywheel Horsepower |
| Option, Attachment | 205-228 | Using Car Radio (Explanation of Parts, Method of Use, Precautions of Use, Specifications), Using Car Cooler (Control Panel, Precautions When Using, Maintenance of Car Cooler) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Hydraulic oil filter replacement frequency | Every 250 hours | p. 143 |
| Engine oil filter replacement frequency | Every 250 hours | p. 143 |
| Standard tightening torque for bolts and nuts (Thread diameter 6mm) | 13.2 Nm | p. 149 |
| Engine Oil Pan Capacity (Refill) | 8.7L | p. 144 |
| Hydraulic System Capacity (Refill) | 36.0L | p. 144 |
| Fuel Tank Capacity | 80.0L | p. 144 |
| Cooling System Capacity | 8.0L | p. 144 |
| Operating Weight (Rubber shoe, cab) | 5250 kg | p. 202 |
| Operating Weight (Steel shoe, cab) | 5300 kg | p. 202 |
| Flywheel Horsepower | 28.7 kW | p. 202 |
| Hydraulic Relief Pressure | 17162 kPa | p. 228 |
| Fan Belt Deflection | 10-15 mm | p. 191 |
Komatsu PC50UU-2 Common Problems This Manual Covers
Komatsu PC50UU-2 boom and arm slow down badly after hydraulic oil warms up
Check hydraulic oil level with the machine parked on level ground and the bucket lowered. Replace the hydraulic filter element if it is past the 250 hour interval listed on page 143; a clogged element restricts flow as oil thins. Work through the troubleshooting charts starting on page 122 before calling your distributor.
Manual Section: Troubleshooting p. 122Control lever binds or feels sticky intermittently once the machine has warmed up
Verify the lock lever is fully released and moves freely through its full travel. Follow the warming-up procedure starting on page 52 before working; cold, thick oil makes pilot controls feel stiff. Check hydraulic oil level and grade, noting the 36.0L refill capacity on page 144. If binding continues, have your Komatsu distributor inspect the pilot valve.
Manual Section: Operation Procedures and Checks p. 52Rubber track runs loose and sags, track walks off the idler on uneven ground
Measure the clearance between the rubber track and the frame with the machine on level ground; spec is 10-15 mm per page 169. Adjust tension following the rubber shoe procedures starting on page 105. Inspect the shoe for cuts or exposed cords, and clean packed mud from the idler and sprocket.
Manual Section: Handling Rubber Shoes and Transportation p. 169Engine cranks slowly or will not start at all on cold mornings
Check battery charge and clean the terminals before cold starts. Switch to the cold weather fuel and lubricants listed on page 116, since summer diesel gels and thick oil drags the starter. Verify fan belt deflection is 10-15 mm per page 191 so the alternator keeps the battery charged.
Manual Section: Cold Weather and Long-Term Storage p. 116Swing and arm speeds vary and hydraulics make noise right after startup
Check the phenomena that are not failures list opening the troubleshooting section on page 122; some arm, swing, and 4-system speed variation is normal while oil warms. Follow the warming-up procedure starting on page 52. If noise continues with hot oil, replace the hydraulic filter element; the first change comes at 100 to 150 hours per page 190.
Manual Section: Phenomena That Are Not Failures p. 122Frequently Asked Questions
What is the procedure to reset the Komatsu PC50UU-2 boom/stick/bucket circuit after an automatic stop?
If the interference prevention device triggers an automatic stop, you must move the work equipment to the front or to the right to move it away from the operator's compartment. Do not attempt to raise the boom, pull in the arm, or operate the left offset after the stop. If the cancel switch is used, you must move the bucket to the front or right to cancel the self-diagnosis. p. 98
What do the error codes on the Komatsu PC50UU-2 monitor panel mean?
Error codes indicate specific abnormalities in the 4-system. For example, error code 61 indicates an abnormality in the automatic stop position. If an error code is displayed on the depth display, you must follow the procedures in the 'Action to take after self diagnosis' table on page 133 to safely move the machine and have it checked immediately. p. 133
What are the torque specifications for bolts on the Komatsu PC50UU-2?
The tightening torque is determined by the width across the flats of the nut and bolt. For a 10 mm diameter bolt with a 17 mm width across flats, the torque is 65.7 ± 6.8 Nm (48.5 ± 5.0 lbft). For a 24 mm diameter bolt with a 36 mm width across flats, the torque is 927 ± 98 Nm (684 ± 72 lbft). p. 149
What is the standard track tension for the Komatsu PC50UU-2 with rubber shoes?
The standard tension for rubber shoes is a clearance of 10 to 15 mm (0.39 to 0.59 in) between the roller surface of the track shoe and the track roller tread at the 3rd track roller from the sprocket. If the clearance is more than 20 mm (0.79 in), the track is too loose and must be adjusted. p. 169
What is the engine oil capacity for the Komatsu PC50UU-2?
The engine oil pan has a specified capacity of 9.1 liters (2.4 US gal, 2.0 UK gal) and a refill capacity of 8.7 liters (2.3 US gal, 1.9 UK gal). p. 144
What exactly do I receive with this Komatsu PC50UU-2 Operator Manual?
Instant PDF download. You get the full 228-page searchable Operator Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Can I print this Komatsu PC50UU-2 manual?
Yes, printing is unrestricted: a single page, a chapter, or the lot, on letter or A4.
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