GROVE Published 10-21-2010, Control# 198-04 4-57
5540F/YB5515 SERVICE MANUAL HYDRAULIC SYSTEM
Disassembly
1. Remove retaining ring 1 Figure 4-61 and retainer 2.
Remove and discard thrust washer 3 and o-ring 4.
2. Carefully pull the swivel spool 10 from swivel housing 5.
If the swivel can not be pulled from the swivel, hit the top
of the swivel shaft with a soft hammer.
3. Remove and discard o-ring 6 and all seals and wear
rings from spool 10.
Inspection
Wash the housing and spool in a suitable solvent. Check the
housing for damage. If there is scoring or deep grooves, the
housing must be replaced.
Use compressed air to remove foreign materials from the
passages in the swivel spool. Check the spool for rough
edges that could cause damage to the seals during
installation.
Install new seals, wear rings and thrust washers.
Assembly
NOTE: The hard rubber piston seal 11 Figure 4-61 must be
warm before installation. Heat the seal with a
trouble lamp. Do not apply lubricant to the loader
before installation.
1. Place the spool on the work bench in the vertical
position.
2. Walk one seal 8 down each groove until it reaches the
last groove. Then slide seal down the spool until it seats
in groove on the spool.
3. Install an o-ring 11 into each of the eight grooves on the
spool.
4. Install one heated piston seal 12 over each o-ring.
5. Install the two wear rings 9 into their appropriate
grooves.
6. Install o-ring 7 into its groove.
7. Place the swivel housing 5 on the work bench with the
bottom of housing facing up. Lubricate the lower 1/4 of
the swivel bore with hydraulic fluid.
8. Place o-ring 6 on the end of the swivel housing 5 and
then insert the assembled spool into the housing until it
is seated. Be careful not to pinch or cut o-ring (6).
9. Turn the swivel over and install thrust washer 3 and o-
ring 4. Install retaining ring 2 and secure with retaining
ring 1.
Test
Pressure test the hydraulic swivel to 5000 psi (34 475 kPa).
Test each port individually. No leakage past seals is
permitted.
Installation
1. Put the hydraulic swivel in place on the machine. Fasten
the hydraulic swivel to the brackets in the mast using
three bolts and lockwashers.
2. Install the swivel stop to the bottom of the hydraulic
swivel using three bolts and lockwashers.
3. Connect the hydraulic lines to the lower ports of the
hydraulic swivel.
4. Fill the lower hydraulic system by adding recommended
hydraulic oil through the upper ports of the hydraulic
swivel.
5. Connect the hydraulic lines to the upper ports.
6. Start the engine and move the hydraulic oil through the
swivel. Visually, check for leaks.
CAUTION
Take care not to damage any of the seals and o-rings
during installation.
CAUTION
Do not rotate the mast until the oil has moved through the
hydraulic swivel for several minutes.
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