Inspection - JLG 400S Service And Maintenance Manual

Inspection

Wash all parts after disassembly (including end-cap and hous-
ing) thoroughly with clean solvent and allow to air dry. Blow
out oil passages in housing and endcap 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 pistons for damage and discoloration. Discolored pis-
tons may indicate excessive heat. Do not reuse.
SLIPPERS
Inspect running surface of slippers. Replace piston assemblies
with scored or excessively rounded slipper edges. Measure
slipper foot thickness. Replace piston assemblies with exces-
sively worn slippers. Check slipper axial end-play. Replace pis-
ton assemblies with excessive end-play.
Minimum slipper foot thickness and maximum axial end-play
are shown in table 3.6.
Measurement
Minimum Cylinder Block Height (A)
Cylinder Block Surface Flatness
3121671
BALL GUIDE AND SLIPPER RETAINER
Inspect ball guide and slipper retainer for damage, discolor-
ation, or excessive wear. A discolored ball guide or slipper
retainer indicates excessive heat. Do not reuse.
CYLINDER BLOCK
Measure cylinder block height. Replace blocks worn beyond
minimum height specification. Inspect running surface of cyl-
inder block. Replace or resurface worn or scratched blocks.
Blocks may be resurfaced if resurfacing will not reduce block
height below minimum specification shown in Table 3-7, Cyl-
inder Block Measurements.
Table 3-7. Cylinder Block Measurements
L25 L30
50.8 (2.00) 50.8 (2.00)
0.002 0.002
(0.0000079) (0.0000079)
SECTION 3 - CHASSIS & TURNTABLE
Table 3-6. Slipper Foot Thickness & End Play
Measurement
Slipper Foot Thickness
mm
(in.)
Piston/Slipper End Play
L35 K38
50.8 (2.00) 54.4 (2.14)
0.002 0.002
(0.0000079) (0.0000079)
A
L Frame K Frame
2.71 4.07
(0.11) (0.16)
0.15
(0.006)
Slipper retainer
Ball guide
K45
54.4 (2.14)
0.002
(0.0000079)
3-33