4.9 Service procedure
Every 2000 hours service Maintenance
4-84 WA470-6H – VEAM946100
Checking function of accumulator
For details of handling the accumulator, see "Accumulator
(2-37)".
PPC accumulator
If the engine stops with the work equipment raised, and it is
impossible to start the engine again, it is possible as an emer-
gency measure to actuate the valve with the oil pressure stored
in the accumulator and lower the work equipment to the ground.
1. Apply the parking brake.
2. Raise the work equipment to the maximum height, then
operate the lift arm control lever to HOLD position (b).
3. Stop the engine.
4. Leave the work equipment lock lever in the FREE position.
5. Check that the area around the machine is safe, then oper-
ate the lift arm control lever to FLOAT position (d) and lower
the work equipment to a point 1m above the ground.
6. When the lift arm comes to the 1 m position, return the lift
arm control lever to LOWER position (c), and lower the work
equipment slowly to the ground.
REMARK
Carry out the check within 2 minutes after stopping the engine. If
the machine is left with the engine stopped, the accumulator
pressure will drop and it will be impossible to check the cause of
the problem.
If the work equipment stops while it is moving, the gas pressure
in the accumulator has probably dropped.
Please contact your KOMATSU distributor to have the accumu-
lator inspected.
Replace the accumulator every 4000 hours or every 2 years.
GK038040
a
b
c
d
GK043216
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