SECTION 3 - CHASSIS & TURNTABLE
3-26
– JLG Lift –
3121659
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.
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 3-6. 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)
Slipper retainer
Ball guide
A
Table 3-7. Cylinder Block Measurements
Measurement
L25
L30
L35
K38
K45
Minimum Cylinder Block Height (A)
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)
Summary of Contents for JLG 450AJ
Page 2: ......
Page 32: ...SECTION 1 SPECIFICATIONS 1 18 JLG Lift 3121659 NOTES...
Page 80: ...SECTION 4 BOOM PLATFORM 4 2 JLG Lift 3121659 Figure 4 1 Boom Assembly...
Page 81: ...SECTION 4 BOOM PLATFORM 3121659 JLG Lift 4 3 Figure 4 2 Main Boom Assembly Sheet 1 of 2...
Page 82: ...SECTION 4 BOOM PLATFORM 4 4 JLG Lift 3121659 Figure 4 3 Main Boom Assembly Sheet 2 of 2...
Page 83: ...SECTION 4 BOOM PLATFORM 3121659 JLG Lift 4 5 Figure 4 4 Upper Boom Assembly...
Page 84: ...SECTION 4 BOOM PLATFORM 4 6 JLG Lift 3121659 Figure 4 5 Jib Assembly...
Page 118: ...SECTION 4 BOOM PLATFORM 4 40 JLG Lift 3121659 NOTES...
Page 156: ...SECTION 5 BASIC HYDRAULIC INFORMATION HYDRAULIC SCHEMATICS 5 38 JLG Lift 3121659 NOTES...
Page 164: ...SECTION 6 JLG CONTROL SYSTEM 6 8 JLG Lift 3121659 Figure 6 2 Tilt Sensor Location...
Page 169: ...SECTION 6 JLG CONTROL SYSTEM 3121659 JLG Lift 6 13 Figure 6 7 Analyzer Connecting Points...
Page 181: ...SECTION 6 JLG CONTROL SYSTEM 3121659 JLG Lift 6 25 Figure 6 19 Platform Module Sheet 1 of 2...
Page 182: ...SECTION 6 JLG CONTROL SYSTEM 6 26 JLG Lift 3121659 Figure 6 20 Platform Module Sheet 2 of 2...
Page 224: ...SECTION 6 JLG CONTROL SYSTEM 6 68 JLG Lift 3121659 NOTES...
Page 340: ...SECTION 7 BASIC ELECTRICAL INFORMATION ELECTRICAL SCHEMATICS 7 116 JLG Lift 3121659 NOTES...
Page 341: ......
