Komatsu 830E-AC Shop Manual page 748

Cleaning and Inspection
1. Discard all O-rings and backup rings. Clean all
parts in solvent and dry with compressed air.
2. Inspect all springs for breaks or distortion.
Inspect poppet seating surfaces for nicks or
excessive wear. All seats must be sharp and
free of nicks.
3. Inspect all bores and surfaces of sliding parts
for nicks, scores or excessive wear.
4. Inspect poppets in their respective bore for fit.
Poppets should move freely, without binding,
through a complete revolution.
5. Inspect fit and movement between sleeve and
low pressure relief valve.
FIGURE 8-6. RESTRICTOR POPPET REMOVAL
1. Inlet Cover
2. Restrictor Poppet
3. Backup Ring
4. O-Ring
5. Backup Ring
L8-6
6. Backup Ring
7. O-ring
8. Backup Ring
9. Sleeve
Hoist Circuit Component Repair
Assembly
1. Coat all parts including housing bores with
clean type C-4 hydraulic oil. Lubricate O-rings
lightly with a multipurpose grease.
2. If restrictor poppet (2, Figure 8-6) was removed,
reassemble in the order shown.
3. Install poppets (11, Figure 8-5) in their respec-
tive bores. Install springs (12).
4. Install O-rings (10), and cover (13). Install cap
screws (14). Tighten cap screws to 81 N·m (60
ft lbs) torque.
5. Install low pressure relief (7) in sleeve (6) and
install assembly in housing (9). Install main
relief valve (4). Install springs (3 & 5). Install
cover (2). Install cap screws (1). Tighten cap
screws to 81 N·m (60 ft lbs) torque. Connect
external tube, tighten nuts to 34 N·m (25 ft lbs)
torque.
SPOOL SECTION
Disassembly
NOTE: It is not necessary to remove the inlet
sections (4, Figure 8-2) to accomplish spool section
(3) disassembly.
1. Match mark or identify each part when removed
in respect to its location or respect to its mating
bore to aid reassembly.
2. Remove cap screws and remove spool section
cover (2, Figure 8-2). Remove and discard O-
rings (4 & 5, Figure 8-8).
3. Remove poppet (1, Figure 8-7), remove and
discard O-ring (3).
NOTE: The poppet (1) is equipped with a small steel
ball. Do not misplace.
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