Complete digital official shop manual contains service, maintenance, and troubleshooting information for the Komatsu PC75UU Hydraulic Excavator. Diagnostic and repair procedures are covered in great detail to repair, maintain, rebuild, refurbish or restore your excavator like a professional mechanic in local service/repair workshop. This cost-effective quality manual is 100% complete and intact as should be without any missing pages. It is the same factory shop manual used by dealers that guaranteed to be fully functional to save your precious time.
This manual for Komatsu PC75UU-2 Hydraulic Excavator is divided into different sections. Each section covers a specific component or system and, in addition to the standard service procedures, includes disassembling, inspecting, and assembling instructions. A table of contents is placed at the beginning of each section. Pages are easily found by category, and each page is expandable for great detail. It is in the cross-platform PDF document format so that it works like a charm on all kinds of devices. You do not need to be skilled with a computer to use the manual.
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BLEEDING AIR FROM HYDRAULIC CIRCUIT
* When the pump, cylinders or other hydraulic equipment or piping have been removed and installed
again after repair, or when the hydraulic oil has been replaced, or when a hydraulic breaker or other new attachment has been installed for the first time, always bleed the air as follows.
1. Adding oil
Add oil to the hydraulic tank to the specified level.
2. Bleeding air from main pump
1) Remove the oil filler cap from the hydraulic tank.
2) Loosen air bleed plug (1) and check that oil (clear oil or oil with bubbles) flows out from the plug.
3) When no more bubbles come out with the oil, tighten plug (1).
4) Tighten the oil filler cap of the hydraulic tank.
3. Bleeding air from cylinders
1) Start the engine and run at low idling for approx. 5 minutes.
2) Keep the engine at low idling, and raise and lower the boom 4- 5 times in succession. * Operate the piston rod to approx. 100mm before the end of its stroke. Do not relieve the circuit at the end of the stroke under any circumstances.
3) Next, run the engine at low idling, and operate the cylinder 3 - 4 times to the end of its stroke.
4) Repeat Steps 2) and 3) to bleed the air from the arm, bucket, offset, and blade cylinders.
4. Bleeding air from swing motor
1) Run the engine at low idling and swing three turns to the left.
2) Next, swing three turns to the right.
5. Bleeding air from swing motor
1) Run the engine at low idling, then use the work equipment to raise the left track from the ground.
2) Keep the engine at low idling and rotate the left track for approx. 30 seconds.
3) Repeat the procedure in Steps 1) and 2) to rotate the right track.
6. Bleeding air from attachment (hydraulic breaker, etc.)
When installing a hydraulic breaker or other attachment for the first time, run the engine at low idling and bleed the air by repeatedly operating the attachment until the air is completely bled from the attachment and circuit. * If there is any specified procedure for bleeding the air from the attachment itself, follow the specified procedure to bleed the air.
7. Bleeding air from hydraulic tank
1) Set in the oil level inspection posture and stop the engine. * If the oil level in the hydraulic tank is low, add oil to the specified level.
2) Leave the machine as it is for a short time after stopping the engine, and wait for the bubbles in the hydraulic tank to disappear.
8. Bleeding air from main pump (repeat) * Repeat the procedure in Step 2 to bleed the air again from the main pump.
9. Pressurizing hydraulic tank
1) Run the engine at low idling and operate all the cylinders slowly to the end of their stroke.
2) Stop the engine, remove the oil filler cap from the hydraulic tank, then install it again. * This will pressurize the tank.
* Until the above air bleeding operations are completed, do not run the engine at high idling under · any circumstances. * After completing the air bleeding procedure, always run the engine at low idling for 10 minutes after starting it before going on to operations.