Toro Groundsmaster 3280-D Service Manual page 103

9. Remove lockout seat (item 22) with o--ring (item 23)
from control valve body. Remove detent plunger (item
19).
10.If control valve is equipped with counterbalance
valve (Fig. 44), remove valve from control valve if need-
ed. Counterbalance valve disassembly is not recom-
mended.
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 detent 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. 43)
IMPORTANT: Do not wipe parts with dry paper tow-
els or rags. Lint may cause damage to the hydraulic
system.
CAUTION
Use eye 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. Install new o--rings into control valve spool bore.
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. Torque screw from 24 to 36 in--lb (2.7
to 4.1 N--m).
Groundsmaster 3280--D/3320
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 (2.7 to 4.1 N--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 and 24) to lockout seats
(items 22 and 25). 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), poppet stop (item 10)
and spring (item 2) liberally with clean hydraulic fluid and
install into control valve bore.
11. Install adapter plug (item 14) with new o--ring (item
15) and 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 counterbalance valve was removed, carefully
thread valve into control valve housing (Fig. 44). Torque
counterbalance valve from 35 to 40 ft--lb (47 to 54 N--m).
2
3
35 to 40 ft- -lb
(47 to 54 N- -m)
1. Lift control valve
2. Spool
Rev. A
Page 5 - - 57
1
Figure 44
3. Counterbalance valve
Hydraulic System