3. Remove the retainer (H70) and the charge pump cover (J15). Remove and discard O-ring (J40). Note
the orientation of the gerotor assembly (H05).
Retainer screw wrench size
Frame size Wrench size
030 – 100 10 mm
130 – 250 13 mm
Current charge pump configuration
Refer to appropriate Danfoss Series 90 service parts manual for earlier charge pump configurations.
4. Remove the charge pump coupling (H50) and charge pump drive key (H60).
5. Remove the charge pump gerotor assembly (H05).
6. Remove the alignment pin (H40).
7. Remove the inner port plate (H31).
Inspection
Inspect all parts for abnormal wear or damage and replace if necessary.
If installing a different displacement charge pump, the gerotor assembly, gerotor outer eccentric ring,
and inner port plate (early and late production pumps) or outer spacer plate(s) (intermediate production
pumps) must be replaced together. If different thickness port plates are used in an early production
charge pump assembly, the thicker plate is the inner port plate (installed next to the pump end cap).
Different production charge pump assemblies include a different quantity / type of port plates and
spacer plates.
Reassembly
Be sure to install the charge pump in the proper orientation. If unsure of charge pump rotation, refer to
the model code.
Service Manual
Series 90 Pumps
Minor repair
520L0818 • Rev 0101 • August 2015 53
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