JLG 680S, Service And Maintenance Manual

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SECTION 5 - BASIC HYDRAULICS INFORMATION & SCHEMATICS
5-60 3121234
Charge Pump Adapter Assembly
DISASSEMBLY
1. Remove plug, shims, spring, and poppet from adapter
assembly as shown in Figure 5-94.
Inspection
• Inspect the charge pump relief valve seat inside the charge
pump adapter. Check to insure that seat is smooth and free
of burrs or other defects.
• Inspect the charge pump relief valve spring.
• Inspect the bearing or bushing inside the charge pump
adapter. The bearing needles must remain in the bearing
cage and bearing at dimension shown in Figure 5-93. The
bushing must have no excessive scoring.
• Inspect the gerotor pocket inside the charge pump
adapter assembly. It should not be scored excessively.
ASSEMBLY
1. If necessary, press new bearing or bushing in adapter
assembly. The bearing to dimension shown in Figure 5-
93. with the numbered end of bearing outward and
closest to mounting flange. The bushing is to be pressed
flush to 0.254 mm (0.010 in.) recessed.
2. Install poppet. spring, shims, new o-ring on plug, and
plug into adapter assembly. Torque plug 30 to 27 ft. lbs.
(40.7 to 36.6 Nm).
Gerotor Pocket
Flange
2.41 mm
(0.095 in.)
Numbered End
Figure 5-93. Bearing or Bushing Inspection
1
2
3
4
5
6
7
8
Charge Pump
Suction Port
Gerotor Ring
Pocket
1. Charge Pump Adapter
2. Bearing
3. Bushing
4. Poppet
5. Spring
6. Shims
7. 0-ring
8. Plug
Figure 5-94. Charge Pump Adapter Assembly