JLG 530LRT, Service And Maintenance Manual

Page: 69 / 262

SECTION 3 - CHASSIS, PLATFORM & SCISSOR ARMS
3121781 3-27
28. Turn the block over. Using a press, apply pressure on
the block spring washer (50) to compress the block
spring. Compress the spring enough to safely
remove the spiral retaining ring (51). While maintain-
ing pressure, unwind the spiral retaining ring (51).
Carefully release the pressure and remove the outer
block spring washer (50), block spring (52), and inner
block spring washer (53) from the cylinder block.
Inspection
After disassembly, wash all parts (including the end-cap
and housing) thoroughly with clean solvent and allow
to air dry. Blow out oil passages in the housing and end-
cap with compressed air. Conduct inspection in a clean
area and keep all parts free from contamination. Clean
and dry parts again after any rework or resurfacing.
PISTON
Inspect the pistons for damage and discoloration. Dis-
colored pistons may indicate excessive heat; do not
reuse.
SLIPPERS
Inspect the running surface of the slippers. Replace any
piston assemblies with scored or excessively rounded
slipper edges. Measure the slipper foot thickness.
Replace any piston assemblies with excessively worn
slippers. Check the slipper axial end-play. Replace any
piston assemblies with excessive end-play.
Minimum slipper foot thickness and maximum axial
end-play are given in the table below.
CYLINDER BLOCK
Measure the cylinder block height. Replace blocks worn
beyond the minimum height specification. Inspect the
running surface of the cylinder block. Replace or resur-
face worn or scratched blocks. Blocks may be resurfaced
to the specifications shown in the drawing, provided
resurfacing will not reduce the block height below the
minimum specification. Table 3-8, Cylinder Block Mea-
surements.
Slipper
Maximum end play
M inimum
slipper fo ot
thick ness
Table 3-7. Slipper Foot Thickness & End Play
Measurement L Frame K Frame
Slipper Foot Thickness
mm
(in.)
2.71
(0.11)
4.07
(0.16)
Piston/Slipper End Play 0.15
(0.006)
A
Table 3-8. Cylinder Block Measurements
Measurement L25 L30 L35 K38 K45
Minimum Cylinder Block Height (A) mm
(in.)
50.8 (2.00) 50.8 (2.00) 50.8 (2.00) 54.4 (2.14) 54.4 (2.14)
Cylinder Block Surface Flatness 0.002
(0.0000079)
0.002
(0.0000079)
0.002
(0.0000079)
0.002
(0.0000079)
0.002
(0.0000079)