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HYDRAULIC SYSTEM
CD5515-2/YB5515-2 SERVICE MANUAL
4-32
Published 1-20-2017, Control# 483-02
Disassembly
1.
Remove retaining ring (3) Figure 4-25 and washer ring
(2). Remove and discard thrust washer (10) and wiper
ring (5).
2.
Carefully pull the swivel spool (11) from swivel housing
(1). If the swivel spool can not be pulled from the swivel
housing, hit the top of the swivel shaft with a soft
hammer.
3.
Remove and discard thrust washers (10, 12) and all
seals and wear rings from spool (11).
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 square seal (6) Figure 4-25 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 (7) 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 a piston seal (4) into each of the seven grooves
on the spool.
4.
Install one heated square seal (6) over each piston seal.
5.
Install the two wear rings (8) into their appropriate
grooves.
6.
Install wiper ring (9) into its groove.
7.
Place the swivel housing (1) 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 seal (7) on the end of the swivel housing (1) and
then insert the assembled spool into the housing until it
is seated. Be careful not to pinch or cut seal (7).
9.
Turn the swivel over and install thrust washer (10) and
wiper ring (5). Install washer ring (2) and secure with
retaining ring (3).
Test
Pressure test the hydraulic swivel to 344.75 bar (5000 psi).
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.
Reference Only