Komatsu 830E Shop Manual page 525

Dump truck
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Power Down Relief Pressure Adjustment
1. Install a 0-3500 psi (0-25,000 kPa) pressure
gauge at the power down test port "TPD" (3,
Figure 10-9) on the counterbalance manifold
(2).
2. With engine at low idle, allow the steering accu-
mulator to fill and the pump to unload. With the
body resting on the frame, place the hoist lever
in the POWER DOWN position and then read
pressure at "TPD" test port gauge:
Pressure should be 1500 ± 75 psi (10,342
± 517 kPa).
3. If power down relief pressure is not within speci-
fications, remove cap and adjust relief valve (2,
Figure 10-7) on hoist pilot valve (1).
• To increase power down relief pressure, turn
adjusting screw in (clockwise).
• To decrease power down relief pressure, turn
adjusting screw out (counter-clockwise).
NOTE: The power down relief valve is located on the
pilot control valve in the hydraulic components
cabinet located behind the cab.
4. When pressure is within specifications, shut
down engine and move hoist control lever to the
"float" position to allow body to completely rest
on frame rails and allow accumulator to bleed
down completely.
5. Remove pressure gauge.
L10016 05/03
FIGURE 10-7. POWER DOWN RELIEF VALVE
1. Hoist Pilot Valve
Hydraulic Check-out Procedure
2. Relief Valve
L10-13

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