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Service Manual
Minor repair
Series 90 Pumps
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
030 – 100
130 – 250
Current charge pump configuration
H60
H50
J40
J15
J30
H70
H80
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.
520L0818 • Rev 0101 • August 2015
Wrench size
10 mm
13 mm
H40
H05
H31
E101082
53
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