Komatsu 830E-AC Shop Manual page 767

4. Start the engine on the good truck, place the
hoist control in the power down position and
increase engine RPM to high idle to dump the
disabled truck. If the body of the disabled truck
fails to raise, increase the good truck power
down relief pressure as follows:
a. Shut down engine and allow the hydraulic
system to bleed down.
b. Remove the cap from the Hoist Pilot Valve
relief valve (2, Figure 8-13) located in the
hydraulics components cabinet behind the
cab. While counting the number of turns,
slowly screw the relief valve adjustment
screw clockwise until it bottoms.
5. Repeat step 4 to dump the disabled truck.
L08038
Lowering the Body:
6. Place the hoist lever of the good truck in FLOAT
to lower the body. If necessary, momentarily
place the hoist control in POWER UP until the
body is able to descend in FLOAT. Do not
accelerate the engine.
7. After body is lowered, shut down the truck,
bleed the hydraulic system and disconnect the
hoses.
8. Reduce power down relief valve pressure to
normal on good truck by turning the adjustment
counterclockwise the same number of turns as
required in step 4 b.
9. Check power down relief pressure using
instructions in Section L10.
10. Check hydraulic tank oil level.
Hoist Circuit Component Repair L8-25