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.
The orientation of the gerotor assembly outer eccentric ring and the location of the alignment pin in the
end cap determine the charge pump rotation..
Do not mix charge pump parts from different production periods. Always install as a complete assembly.
Orienting alignment pin
Inlet
Discharge
Alignment pin
Gerotor assembly
Right hand rotation
(outside looking into pump)
Gerotor
assembly
Inlet
Discharge
Left hand rotation
(outside looking into pump)
Alignment pin
P104 160E
1. Install the inner port plate (H31) and the gerotor assembly outer ring.
2. Install the alignment pin (H40) to properly orient the port plates and outer eccentric ring for
corresponding pump rotation.
3. Prior to installation, lubricate the I.D., O.D., and side faces of the gerotor assembly.
4. Install the gerotor assembly (H05).
5. Install the outer port plate (early production and intermediate production pumps only).
6. Install the spacer plate, if present (intermediate production pumps).
7. Install the charge pump drive key (H60) into the charge pump coupling (H50) and retain with
petroleum jelly.
Intermediate production 75 cm³ and 100 cm³ pumps use the same charge pump coupling. Two
keyways are provided in the coupling for the charge pumps used in these units. The rear keyway
(with identifier groove) is used in 75 cm³ pumps. The front keyway (closest to the internally splined
end of the shaft) is used in 100 cm³ pumps.
Service Manual
Series T90 Axial Piston Pumps
Minor repair
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©
Danfoss | March 2020
AX216086485386en-000101