Komatsu 830E-AC Shop Manual page 752

HOIST PILOT VALVE
Removal
1. Place the hoist control lever in the body down
position. Make sure the body is in the full down
position. Release the hoist control lever to
return the hoist valve spool to the FLOAT posi-
tion.
2. Disconnect hydraulic lines at the hoist pilot
valve (1, Figure 8-11). Remove cap screws (4).
3. Loosen and unthread jam nut (7). Unthread
sleeve (6) until cotter pin (5) and pin (9) are
exposed.
4. Remove cotter pin (5) and pin (9).
5. Remove the hoist pilot valve mounting hard-
ware (10). Remove hoist pilot valve. Refer to
hoist pilot valve disassembly for repair instruc-
tions.
1. Hoist Pilot Valve
2. Hydraulic Lines
3. Flange
4. Cap Screw
5. Cotter Pin
L8-10
FIGURE 8-11. HOIST PILOT VALVE REMOVAL
6. Sleeve
7. Jam Nut
8. Control Cable
9. Pin
10. Cap Screws
Hoist Circuit Component Repair
Installation
1. Place the hoist pilot valve into position on the
mounting bracket. Secure valve in place with
cap screws (10, Figure 8-11).
2. Position hydraulic lines (2, 13, 14 and 15) over
valve ports and assemble fittings. Tighten
hydraulic line connections securely.
3. Place hoist control lever in spring-centered
position. Adjust pilot valve spool until centerline
of cable attachment hole extends 1.16 in. (29.5
mm) from the face of the valve body.
4. Align control cable eye with pilot valve spool
hole and insert pin (9). Secure pin in place with
cotter key (5).
5. Thread sleeve (6) upward until contact is made
with valve body. Move flange (3) into position
and secure in place with cap screws (4).
6. Thread jam nut (7) against sleeve (6). Tighten
jam nut securely.
7. Start the engine and check for proper hoist
operation. Observe for leaks.
11. Solenoid Valve
(Body Up Limit)
12. Pilot Operated
Check Valve
13. Return Line
14. Pilot Pressure to
Hoist Valve
15. Supply Pressure
From Hoist Valve
L08038