Front Spool Section - Komatsu 930E-2 Shop Manual

FIGURE 8-11. SPOOL INSTALLATION
1. "V" Groove
2. Spool Assembly
8. If used, install O-ring (2, Figure 8-8) and backup
ring (3) on restrictor poppet (1). Install poppet in
spool housing as shown in Figure 8-9.
9. Install new O-rings (4, 5 & 10).
10. Install new O-ring (and backup ring if used) on
poppet (6, Figure 8-9). Make certain the small
steel ball (7) is installed in poppet. Install poppet
in cover (1).
11. With new O-rings (4, 5 & 10) installed, position
cover (1) over spool housing. Secure cover in
place with capscrews. Tighten capscrews to 60
ft. lbs. (81 N.m) torque.
Note: Cover must be positioned according to match
marks made during disassembly. Do not reverse cover
position.
L08024
3. Work Ports
Spool Section
Hoist Circuit Component Repair

FRONT SPOOL SECTION

(Tank Ports)
Disassembly
NOTE: It is not necessary to remove the inlet sections
(1 or 4, Figure 8-2) to accomplish spool section disas-
sembly and repair.
1. Match mark or identify each spool in respect to
its mating bore when removed.
2. Remove capscrews and lift spool section cover
(4, Figure 8-12) from housing.
3. Remove and discard O-rings (5 & 6).
4. Remove capscrews and remove bottom cover (9)
from spool housing. Remove and discard O-
rings.
5. Remove springs (8). Push spools (7) out of
housing bores.
Cleaning and Inspection
1. Discard all O-rings. Clean all parts in solvent and
blow dry with compressed air.
2. Inspect springs for breaks or distortion.
3. Inspect housing bores and surfaces of spools for
nicks, scoring or excessive wear.
Assembly
1. Lubricate spools (7, Figure 8-12) with clean hy-
draulic oil and re-install in their original bores.
Install springs (8).
2. Lubricate O-rings (5 & 6) with clean hydraulic oil.
Install O-rings in bottom of spool housing. Install
bottom cover (9) and secure in place with cap-
screws. Tighten capscrews to 60 ft. lbs. (81
N.m) torque.
3. Lubricate O-rings (5 & 6) and install in top of spool
housing. Install top cover (4) and secure in place
with capscrews. Tighten capscrews to 60 ft. lbs.
(81 N.m) torque..
4. If removed, install plugs (2) with new O-rings (3).
L8-7