Komatsu PC2000-8 BACKHOE, Operation & Maintenance Manual

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OPERATION
DETAILED CONTROLS AND GAUGES
3-149
q
Accumulator for oil cooler circuit
There are six at the oil cooler end inside the power con-
tainer at the rear left of the machine.
REMARK
These accumulators are installed to protect the oil cooler from
abnormal pressure in the hydraulic circuit, and to improve the
reliability of the hydraulic equipment.
METHOD OF RELEASING PRESSURE IN ACCUMULATOR FOR HYDRAULIC CONTROL
CIRCUIT
3
A: Accumulator for cushioning the front idler
B: Accumulator for hydraulic control circuit
C: Accumulator for oil cooler circuit
1. Lower the work equipment to the ground.
2. Stop the engine.
3. Turn the engine starting switch to the ON position.
4. Move the lock lever (1) to the free position (F), and oper-
ate the work equipment control lever and the attachment
operation pedal (optional) back and forth and to the left and
right up to the stroke end in order to release pressure from
the respective control circuits.
5. Start up the engine and stop it in a few seconds. And then
carry out the work 3 and 4 above.
6. Continue the operation in Step 4 until the hissing noise of
pressure oil can no longer be heard. (Approx. 2 - 3 times)
7. Push down lock lever (1) to locking position (L) to lock the
control lever and attachment operation pedal. However,
pressure cannot be released completely, so when remov-
ing the accumulator for the control circuit, loosen the screw
slowly and do not stand in the direction of hydraulic oil
spurting out.