HYDRAULIC SYSTEM CD3340B/YB4411
4-38
Published 04/07/2015 Control # 569-00
12. Carefully remove flange (3, Figure 4-24) from housing
(10).
13. Exclusion seal (2), backup ring (4), pressure seal (5) and
seal (6) will come off with flange (3). Use the seal
removal tool shown in exclusion and pressure seals.
14. A metal plug (12, Figure 4-24), with O-ring (11), plugs a
machined hole in the housing. It is not necessary to
remove the plug and replace the O-ring unless leakage
occurs around the plug. To remove the plug, insert a 5
mm (0.187 in) hex key through the port opening and
push it out.
Inspection/Cleaning
Check all mating surfaces. Replace any parts with scratches
or burrs that could cause leakage or damage. Clean all metal
parts in a suitable solvent. Blow dry with air. Do not wipe
parts with a cloth or paper towels, because lint or other
matter could get into the hydraulic system and cause
damage.
Check around the key slot and chamfered area of the shaft
for burrs, nicks or sharp edges that could damage seals
during assembly. Remove nicks or burrs with a hard smooth
stone. Do not file or grind motor parts.
NOTE: Lubricate all seals with petroleum jelly. Use new
seals when assembling the motor. DO NOT
stretch the seals before installing them.
Cleanliness is extremely important in the successful
application of Loctite. Before Loctite can be applied, the parts
should be cleaned as follows:
NOTE: Fully cured Loctite resists most solvents, oils
gasoline and kerosene and is not affected by
cleaning operations. It is not necessary to remove
cured Loctite that is securely bonded in tapped
holes; however, any loose particles of cured Loctite
should be removed.
1. Wash the housing with a suitable solvent to remove oil,
grease and debris. Pay particular attention to the four
tapped holes on the flange end.
2. Blow dry with compressed air. Clean and dry the tapped
holes.
3. Wire brush the screw threads to removed cured Loctite
and other debris. Discard any screws that have
damaged threads or rounded heads.
4. Wash the screws with a non-petroleum base solvent.
Blow dry with compressed air.
Assembly
Shaft End
1. If plug (12, Figure 4-24) was removed, lubricate the new
O-ring (11) and install on the plug. The plug has two O-
ring grooves, but requires only one O-ring in the groove
closest to the end of the plug. Push the plug into the
housing (10) until it is flush with the housing. Be careful
not to damage the O-ring.
2. Lubricate output shaft (9) with hydraulic oil (Figure 4-29)
and install the shaft into housing (10, Figure 4-24).
NOTE: Do not permit oil to get into the four tapped holes of
the housing (10).
FIGURE 4-26
a0765
Capscrew (4)
Heat With a Propane
Torch To Melt Loctite
FIGURE 4-27
a0766
Modify
Screwdriver as
Shown. Remove
All Burrs
Bend Tip
Radius on
End
Radius
FIGURE 4-28
a0767
Pressure Seal
Exclusion
Seal
Mounting
Flange
Seal Tool
Reference Only
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