Komatsu 830E-AC Shop Manual page 785

NOTE: Each 1/4 turn of the adjustment screw will
cause approximately 1,034 kPa (150 psi) change in
pressure.
e. Install spring (3) and cover (2) with new O-
rings (8). Install and tighten cap screws (1).
f. Check pressure again (Steps 2 - 4).
FIGURE 10-6. HOIST RELIEF VALVE
1. Cap Screw
2. Inlet Cover
3. Spring
4. Main Relief Valve
5. Spring
Power Down Relief Pressure Adjustment
1. Install a 0-25,000 kPa (0-3500 psi) 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 10,342± 517 kPa
(1500 ± 75 psi).
L10028
6. Sleeve
7. Low Pressure Relief
8. O-Rings
9. Inlet Section
Hydraulic Check-out Procedure
3. If power down relief pressure is not within spec-
ifications, 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.
FIGURE 10-7. POWER DOWN RELIEF VALVE
1. Hoist Pilot Valve 2. Relief Valve
L10-17