Service Manual
Lift Control Valve Service
Disassembly (Fig. 24)
1. Wash control valve in solvent and dry it thoroughly.
2. Mount control valve into a vise so the mounting pads
a
re against the jaws of the vice and snap ring faces up.
NOTE: Remove check valve seat only if it needs re-
placement; it is pressed into the valve body
.
3. Remove plugs and o–rings from the valve body. Re-
move springs, balls and cam pins from the valve body
.
4. Remove snap ring from the bottom of the valve body.
Remove spool snap ring, spring retainer
, spacer and
spring.
5. Push and twist spool carefully out of the valve body
.
Set spool aside.
6. Remove o–rings from valve body using a soft
hooked scribe or a thin screwdriver taking care not to
scratch the valve bore finish.
Inspection (Fig. 24)
CAUTION
Use eye protection such as goggles when using
compressed air
1. Wash all parts in solvent. Dry parts with compressed
air.
2. Inspect spool for bending and flatness. Signs of wear
o
n one side of the spool may indicate damage. Replace
a worn or damaged spool if necessary.
3. Inspect other components for wear or damage, and
replace damaged items as necessary
.
Assembly (Fig. 24)
1. Coat all new o–rings with 10W30 engine oil. Install
new o–rings into the bore of the valve body
.
2. Coat spool lightly with 10W30 engine oil. Push and
twist s
pool carefully into the valve body. Avoid damaging
o–rings.
3. Install spring retainer
, spring, spacer, second spring
retainer and spool snap ring onto the spool. Install snap
ring into the valve body.
8
9
7
5
3
1
6
9
10
4
11
2
12
10
14
13
Figure 24
1. Plug 8. Spool
2. O–ring 9. O–ring
3. Spring 10. Spring
retainer
4. Ball 1
1. Spring
5. Check valve seat 12. Spacer
6. Cam pin 13.
Spool snap ring
7. Control valve body 14. Snap
ring
4. If check valve seat was damaged and removed,
press fit replacement into the valve body.
5. Lubricate and install cam pin, ball and spring. Place
n
ew o–ring on plug and install into the valve body. Tight-
en plug.
6. Repeat steps 4 and 5 for the second plug assembly
.
Hydraulic System Page 4 – 28 Greens Aerator