Jacobsen SLF 1880, Technical/Repair Manual

Page: 166 / 236

8H-64
Swashblock Group (Figure 8H-7)
Figure 8H-7. Swashblock Group Disassembly
INSPECTION
• Clean all parts thoroughly.
• Discard all seals and o-rings and replace with new
ones.
• Check all locating pins for damage.
• Check all springs for cracks or distortion, replace if
necessary.
• Check the fit of the control pin in swashblock, there
should be no play.
• Inspect the valve plate surface that mates with
cylinder barrel for excessive wear or scoring.
Replace valve plate and cylinder barrel if damage is
present.
• Examine all relief valves and seats for wear, scoring
or excessive damage. Replace if necessary.
• Inspect the cylinder barrel piston bores and the face
that mates with the valve plate for wear or damage.
• Inspect the cylinder bearing and barrel, replace if
worn or damaged.
• Piston shoes must pivot smoothly, end play should
not exceed 0.003” (0.076 mm). To check end play
proceed as follows:
1. Place square end of piston on a bench and hold
firmly.
2. Pull on the end of the hose with the other hand
and note the end play. A good piston/shoe fit will
have no end play with the shoe free to rotate and
pivot on the piston ball.
• Check each shoe for proper thickness (Figure 8H-
8). All shoes must be equal within 0.001” (0.025
mm). The shoes should be replaced as a set.
• Inspect swashblock for wear, scoring or damage.
Replace if worn or damaged.
Figure 8H-8. Piston and Shoe Thickness
• Compare saddle-bearing thickness in the wear area.
If difference in thickness is greater than 0.010” (0.25
mm) replace saddle bearings.
• Inspect mating surface of swashblock for cracks or
excessive wear. Swashblock should move freely
and smoothly.
• Examine the seal area of the drive shaft for scoring
or roughness.
• Inspect the front shaft bearing for roughness,
galling, or binding, replace if necessary.
• Check shaft and splines for wear and straightness,
replace if necessary.
• Check the faces of the gerotor pump assembly and
the matching faces of the valve plate and rear plate
for scratches or damage. If wear is present, replace
as necessary.
Swashblock
Saddle
Bearings
Main Case
End play must not exceed
0.0003" (0.076 mm) when
new, or 0.006" (0.152 mm)
when worn.
All shoe faces must
be free of nicks.
All shoes must be equal
within 0.0001" (0.025 mm)
at this dimension.