JLG 1850SJ, Service And Maintenance Manual, Page: 405 / 712

SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS
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BLOCK SPRING, AND WASHERS
If cylinder kit was fully dissembled, visual inspection of the cyl-
inder block, spring, and washers should indicate minimal wear.
Replace if cracks or other damage is present.
CYLINDER BLOCK
Examine the running face of the cylinder block. The surface
should be smooth and free of nicks and burrs. Ensure that no
scratches or grooves exist; these may drastically reduce output
flow.
CONTROL
Carefully examine the plug(s) for signs of wear. Also check the
small tip of the plug(s) for heavy wear and replace if necessary.
Inspect each spool’s springs to make sure they are intact.
Check the inside and outside surfaces of the springs for wear
and replace if necessary. Check the spool’s outside diameter
for scratches and / or burrs. Clean and coat all spools, bores,
and seals with a light coating of hydraulic oil.
INPUT SHAFT
Check to see that the shaft (J010) and its splines are straight
and free of damage or heavy wear. Inspect the shaft surface
where it meets the shaft seal. Replace the shaft if a groove
exists at the sealing land surface that may let dirt into or
hydraulic fluid out of the unit. Clean the sealing area with a
nonabrasive material if necessary. Lubricate the shaft with a
light coat of hydraulic fluid.
J Frame 45-60 cc 65-75 cc
Minimum cylinder block height (A) 62.25 mm
[2.45 in]
Maximum block bore diameter (B) 19.8 mm
[0.785 in]
21.57 mm
[0.85 in]
Washer
Cylinder block spring
Spring retainer
Retaining ring
K041
?at to 0.002 mm
[0.000079 in]
B
A
C112 i
C104
C103
C103A
C105
C105A
C106
C102
C113
C115
C114
C117
C116
C117
C118
C133
C135
C134
C138
C138A
C132
C104A
C106A
J010