JLG 510AJ Service Manual - Manual (Page 92)

SECTION 3 - CHASSIS AND TURNTABLE
3-50 – JLG Lift – 3121181
SWASHPLATE AND JOURNAL BEARINGS
Inspect the running face, servo ball-joint, and swashplate jour-
nal surfaces for damage or excessive wear. Some material
transfer may appear on these surfaces and is acceptable pro-
viding the surface condition meets specifications shown. Mea-
sure the swashplate thickness from the journals to the running
face. Replace swashplate if damaged or worn beyond mini-
mum specification. Replace swashplate if the difference in
thickness from one side to the other exceeds specification.
Inspect the journal bearings for damage or excessive wear.
Replace journal bearings if scratched, warped, or excessively
worn. The polymer wear layer must be smooth and intact.
SHAFT BEARINGS
Inspect bearings for excessive wear or contamination. Rotate
the bearings while feeling for uneven movement. Bearings
should spin smoothly and freely. Replace bearings that appear
worn or do not rotate smoothly.
SHAFT
Inspect the motor shaft. Look for damage or excessive wear on
the output and block splines. Inspect the bearing surfaces and
sealing surface. Replace shafts with damaged or excessively
worn splines, bearing surfaces, or sealing surfaces.
SERVO PISTON AND MINIMUM ANGLE STOP
Inspect the minimum angle stop, servo piston head, and servo
piston ball-socket for damage or excessive wear. Replace if
necessary.
LOOP FLUSHING SPOOL
Inspect the loop flushing spool. Check for cracks or damage.
Replace if necessary.
LV
25.8 mm
[1.015 in]
24.6 mm
[0.969 in]
KV
Thickness equality
side to side:
0.05 mm [0.002 in]
0.0025 mm
[0.0001 in]