SECTION 5 - HYDRAULICS
3121290
– JLG Lift –
5-63
5.
Install new O-ring on valve plug. Reinstall poppet,
spring, and plug (with shims and O-ring) into pump
housing. Torque to 40-100 ft-lb (55-135 Nm).
SCREW ADJUSTABLE STYLE
1.
Mark plug, lock nut, and housing to maintain original
adjustment before removing screw adjustable relief valve
plug. Loosen lock nut (1-1/16" Hex) and remove plug (8
mm Int. Hex). Remove O-ring from plug.
2.
Remove spring and poppet from housing.
3.
Inspect poppet and mating seat in housing for damage
or foreign material.
4.
Install new O-ring on valve plug. Reinstall poppet and
spring. Reinstall plug and lock nut. Torque to 34 - 42 ft-lb
(47-57 Nm), aligning marks made at disassembly.
5.
Check and adjust charge pressure if necessary. For screw
adjustable “anti-stall” charge relief valves, an approxi-
mate rule of thumb is 2.8 bar/quarter turn (40 psi/quar-
ter turn).
6.
Measure charge pressure (port M3) with pump in stroke.
Charge pressure should level off when relief setting is
reached.
Shaft Seal and Shaft Replacement
A lip type shaft seal is used in Series 42 pumps. Seal and shaft
can be replaced without major unit disassembly. Replacement
generally requires removing pump from machine.
Figure 5-112. Installation of Shaft Seal
1. Lock Nut
2. O-Ring
3. Plug
4. Spring T-Seal
5. Poppet
Figure 5-110. Screw Adjustable Charge Relief Valve
Components
1. Retaining Ring
2. Seal Carrier Assembly
Figure 5-111. Shaft Seal Removal
1. O-Ring
2. Seal
3. Seal Carrier
4. Use sealant on outside diameter
5. Inside Lip (face down)
6. Press Seal to Bottom of Seal Carrier
Summary of Contents for 450A II Series
Page 46: ...SECTION 3 CHASSIS TURNTABLE 3 6 JLG Lift 3121290 Figure 3 4 Drive Hub 4WD Front Only ...
Page 79: ...SECTION 3 CHASSIS TURNTABLE 3121290 JLG Lift 3 39 Figure 3 32 Swing Bearing Drive ...
Page 101: ...SECTION 3 CHASSIS TURNTABLE 3121290 JLG Lift 3 61 Figure 3 42 Auxiliary Pump ...
Page 113: ...SECTION 3 CHASSIS TURNTABLE 3121290 JLG Lift 3 73 Figure 3 53 EMR2 Fault Codes Sheet 1 of 5 ...
Page 114: ...SECTION 3 CHASSIS TURNTABLE 3 74 JLG Lift 3121290 Figure 3 54 EMR2 Fault Codes Sheet 2 of 5 ...
Page 115: ...SECTION 3 CHASSIS TURNTABLE 3121290 JLG Lift 3 75 Figure 3 55 EMR2 Fault Codes Sheet 3 of 5 ...
Page 116: ...SECTION 3 CHASSIS TURNTABLE 3 76 JLG Lift 3121290 Figure 3 56 EMR2 Fault Codes Sheet 4 of 5 ...
Page 117: ...SECTION 3 CHASSIS TURNTABLE 3121290 JLG Lift 3 77 Figure 3 57 EMR2 Fault Codes Sheet 5 of 5 ...
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Page 173: ...SECTION 3 CHASSIS TURNTABLE 3121290 JLG Lift 3 133 Sensor Transducer Type ...
Page 177: ...SECTION 3 CHASSIS TURNTABLE 3121290 JLG Lift 3 137 Sensor Transducer Type ...
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Page 207: ...SECTION 3 CHASSIS TURNTABLE 3121290 JLG Lift 3 167 ...
Page 217: ...SECTION 4 BOOM PLATFORM 3121290 JLG Lift 4 5 Figure 4 2 Boom Limit Switches ...
Page 310: ...SECTION 5 HYDRAULICS 5 70 JLG Lift 3121290 NOTES ...
Page 312: ...SECTION 6 JLG CONTROL SYSTEM 6 2 JLG Lift 3121290 Figure 6 2 Controller Block Diagram 0 ...
Page 370: ...SECTION 6 JLG CONTROL SYSTEM 6 60 JLG Lift 3121290 NOTES ...
Page 394: ...SECTION 7 BASIC ELECTRICAL INFORMATION SCHEMATICS 7 24 JLG Lift 3121290 NOTES ...
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