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Control Valve Spool Seal Replacement
IMPORTANT: To prevent leakage, make sure you
keep foreign material such as dirt, sand or paint
chips out of valve body seal grooves.
NOTE: Except for the seal under No. 4 spool bonnet,
the valve bank does not normally have to be removed
from the machine to replace spool seals.
Front (Chain Link) Side (Fig. 25)
1. Remove the chain link, boot and breather washer
from the spool.
2. Remove the seal retainer, back-up washer and lip
seal from the valve body. Clean the seal groove.
3. Soak the new seal in clean hydraulic fluid. INSTALL
THE SEAL WITH THE OPEN (LIP) SIDE FACING IN
TOWARDS THE VALVE BODY. Install the back-up
washer and seal retainer
4. Install the breather washer, boot and chain link. Start
the engine and check for leaks.
Rear (Bonnet) Side (Fig. 26)
1. Remove the bonnet.
NOTE: The valve bank must be removed in order to
replace the spool seal under the bonnet on No. 4 spool.
2. Disassemble the components attached to the rear of
the spool. (See Control Valve No. 1 Spool Detent Re-
placement and Control Valve No. 4 Spool Detent Re-
placement in this section of the book.)
NOTE: The assemblies under each spool bonnet are
different from one another. Pay close attention to how
they are disassembled so they will be reassembled
correctly.
3. Remove the seal retainer, back-up washer, and lip
seal from the valve body and clean the seal groove.
4. Soak the new seal in clean hydraulic fluid. INSTALL
THE SEAL WITH THE OPEN (LIP) SIDE FACING IN
TOWARDS THE VALVE BODY. Install the back-up
washer, seal retainer and remaining components.
IMPORTANT: Make sure the switch is correctly po-
sitioned and adjusted when bonnet is installed on
No. 2 or No. 4 spool. (See Mow/Lift Switch Replace-
ment and Adjustment or Traction Switch Replace-
ment and Adjustment in Chapter 6 - Electrical
System.)
Figure 25
1. Boot 4. Back-up washer
2. Breather washer 5. Lip seal
3. Seal retainer
Figure 26
1. Seal retainer
2. Back-up washer
3. Lip seal
Repairs Page 4 - 46 Greensmaster
®
3100