Service Manual

Groundsmaster 7200/7210 Hydraulic SystemPage 4 - 87
9. Remove lockout seat (item 22) with O- ring (item 23)
from control valve body. Remove detent plunger (item
19).
10.If necessary, remove plug from control valve (Fig.
102). Note: If machine is equipped with optional rear lift
kit, a fitting and sleeve will be installed in place of plug.
Inspection
1. Inspect spool and spool bore for wear. If wear is ex-
cessive, replace lift control valve assembly.
2. Inspect all springs and replace if damaged or broken.
3. Inspect d etent plunger, detent ball and poppet for
wear. Replace as necessary.
4. Inspect lockout seats for wear or damage. Replace
as necessary.
5. Inspect control valve housing threads and O- ring
sealing surfaces. Replace as necessary.
6. Inspect threads and O- ring sealing surfaces on
plugs. Replace as necessary.
Assembly (Fig. 101)
IMPORTANT: Do not wipe parts with dry paper tow-
els or rags. Lint may cause damage to the hydraulic
system.
CAUTION
Use e ye protection such as goggles when using
compressed air.
1. Clean all control valve components with clean sol-
vent and blow dry with compressed air.
2. Replace all removed O- rings. Lightly lubricate new
O- rings with clean hydraulic oil before assembly.
3. Carefully install new O- rings into control valve spool
bore taking care to not damage O- rings during installa-
tion.
4. Lubricate spool liberally with clean hydraulic fluid
and carefully install into control valve bore.
5. Coat spacer (item 13), spring (item 20) and washer
(item 6) liberally with MPG- 2 (or equivalent) grease. Ap-
ply Loctite #242 (or equivalent) to threads of screw (item
5). Install washer, spring and spacer into valve and se-
cure with screw. Retain spool to prevent it from turning
and torque screw from 24 to 36 in- lb (2.7 to 4.1 N- m).
6. Apply Loctite #242 (or equivalent) to threads of
screws (item 7).
7. Position gasket (item 3) and end cap (item 12) to con-
trol valve. Secure end cap to valve with two (2) screws
with lock washers (item 7). Torque screws from 24 to 36
in-lb(2.7to4.1N-m).
8. Lubricate detent plunger (item 19) with clean hydrau-
lic oil and slide into control valve bore.
9. Install new O- rings (items 23) to lockout seats (items
22). Apply Loctite #242 (or equivalent) to threads of
lockout seats. Install seats into control valve. Torque
seats from 18 to 20 ft- lb (24 to 27 N- m).
10.Lubricate poppet (item 11), spring (item 2) and pop-
pet stop (item 10) liberally with clean hydraulic fluid and
install into control valve bore. Make sure that stop ex-
tends into spring coils after installation.
11. Install adapter plug (item 14) with new O- ring (item
15) a nd plug (item 9) with new O- ring (item 21) into con-
trol valve. Torque plugs from 35 to 40 ft- lb (47 to 54
N-m).
12.Install new O- ring to detent plug (item 16). Lubricate
detent ball (item 1) and spring (item 17) with clean hy-
draulic fluid and install into detent plug.
13.Install detent plug assembly to control valve. Torque
plug from 10 to 15 ft- lb (14 to 20 N- m).
14.If plug was removed, carefully thread plug into con-
trol valve housing (Fig. 102). Torque plug from 60 to 70
ft- lb (81 to 94 N- m).
1. Lift control valve
2. Plug
3. O- ring
Figure 102
2
1
3
60 to 70 ft- lb
(81to94N-m)
Hydraulic
System