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ORIFICE
POPPET COLOR
DIAMETER
Red
.140 in. (3.556 mm)
Green
.093 in. (2.362 mm)
White
.063 in. (1.6 mm)
FIGURE 8-10. POPPET IDENTIFICATION
7. Remove plug (3) from end of spool. Remove
spring seat (2) and spring (11). Remove poppet
(21) and spool end (15).
NOTE: Pay special attention to poppets (12, 21 and 22
Figure 8-9) during removal to ensure proper location
during reassembly. Poppets may be identified with a
colored dot (Red, Green or white). If poppets are not
color coded, use the chart in Figure 8-10 and the
specified drill bit to measure orifice diameter for iden-
tification.
8. Repeat step 7 to disassemble opposite end of
spool (20). Note there is no plug or restrictor
poppet in opposite end and the spring is blue.
9. Remove spool assembly (14). At top end of spool,
remove plug (3). Remove spring seat (2) and
spring (11). Remove poppet (12) and spool end
(15).
10. At opposite end, remove plug (3), spring seat (2)
and spring (16). Remove restrictor poppet (22)
and spool end (15).
11. Remove cover (19), remove O-rings (4, 5 & 10).
Remove poppet (18).
Cleaning and Inspection
1. Discard all O-rings and backup rings. Clean all
parts in solvent and blow 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 all poppets in their respective bore for fit.
Poppets should move freely through a complete
revolution without binding .
L8-6
Assembly
DRILL SIZE
1. Lubricate O-rings (4, 5 & 10, Figure 8-9) with
#28
#42
#52
2. Install spring (11, Figure 8-9) in spool (20). Install
NOTE: Poppets 12, 21 and 22 may be color coded and
must be installed in their original location.
3. Repeat step 2 for the opposite end of spool (20)
4. Lubricate spool assembly and carefully install in
5. Install spring (11, Figure 8-9) in top (grooved) end
6. Repeat step 5 for the bottom end of spool (14).
7. Lubricate the assembled spool and install in
NOTE: Spools (14, Figure 8-9) and (20) are physically
interchangeable. Make sure spool (14) is installed
toward the base port of the spool housing.
Hoist Circuit Component Repair
clean hydraulic oil. Install O-rings in spool hous-
ing. Install poppet (18). Install cover (19) and
secure in place with capscrews. Tighten cap-
screws to 60 ft. lbs. (81 N.m) torque.
spring seat (2). Apply Loctite to the threads of
spool end (15). Install spool end and tighten to
25 ft. lbs. (34 N.m) torque. Install Green poppet
(21). Apply Dri-loc #204 to the threads of plug (3).
Install plug and tighten to 15 ft. lbs. (20 N.m)
torque.
to install spring, spring seat, and spool end.
Make certain spring (16) is blue in color. (A
poppet and plug are not installed in lower end.)
spool housing as shown in Figure 8-11. Make
certain the "V" groove (1) in spool assembly (2)
is positioned up as noted.
of remaining spool (14). Install spring seat (2).
Apply Loctite to the threads of spool end (15).
Install spool end and tighten to 25 ft. lbs. (34
N.m) torque. Install Red poppet (12). Apply Dri-
loc #204 to the threads of plug (3). Install plug
and tighten to 15 ft. lbs. (20 N.m) torque.
Install spring (16) which is blue in color, spring
seat (2) and spool end (15). Apply Loctite to
spool end threads. Install spool end (15) and
tighten to 25 ft. lbs. (34 N.m) torque. Install
White poppet (22). Apply Dri-loc #204 to the
threads of plug (3). Install plug and tighten to 15
ft. lbs. (20 N.m) torque.
spool housing as shown in Figure 8-11. Make
certain the "V" groove is in the up position.
L08024
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