Integral Charge Pressure Filter Replacement - Danfoss T90 Series Service Manual

Service Manual
Series T90 Axial Piston Pumps
Minor repair

Integral charge pressure filter replacement

© Danfoss | March 2020
8. Install the charge pump coupling. The internally splined end of the coupling must engage the main
pump shaft.
The outside diameter of the internally splined end of some early production charge pump couplings
were chamfered. Early production end caps may not be machined to accept a non-chamfered
coupling. Always use a chamfered charge pump coupling in pumps with the early endcap.
9. For pumps with an auxiliary mounting pad, install the auxiliary drive coupling.
10. For pumps with no auxiliary pad, install a new O-ring (J40) onto charge pump cover. (If an auxiliary
pad is installed, an O-ring is not used on the cover.)
11. Carefully remove the alignment pin from the charge pump parts. Install the pin in its hole in the
charge pump cover (J15) (see previous page for correct orientation) and retain with petroleum jelly.
Install the cover (with alignment pin) into the end cap and aligned charge pump parts. (Take care not
to damage the cover O-ring, if used.)
C
Caution
In order to avoid loss of charge pressure in pumps with an auxiliary mounting pad, always install the
charge pump cover with the pad drain hole located on the same side of the end cap as the charge
inlet port. Refer to the section "Auxiliary Pad Installation" for details.
12. Install the charge pump cover retainer (H70) and the six internal hex screws (H80). Torque the screws
per the table at the right..
Retainer screw torque
Frame size
055 – 100
13. For pumps with auxiliary mounting pads, install the O-ring and auxiliary mounting pad adaptor onto
the end cap. Refer to the corresponding section for instructions on auxiliary pad installation.
Removal
1. Remove the filter canister (N40) from the filter head (N10) as described on the canister.
2. Hold the filter head in place and loosen the lock nut (N20) using the wrench size corresponding to
pump frame size.
3. Rotate the filter head counterclockwise to remove it from the housing. Remove and discard the O-
ring (N15).
4. Remove the hydraulic tube (N25) from its bore in the endcap.
Lock nut wrench size and torque
Frame size
055 – 100
Torque
16 N•m [11.85 lbf•ft]
Wrench size
1-5/8 inch
Torque
122 N•m [90 lbf•ft]
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