1
2
3
4
5
7
9
Torque this bolt first and last.
TORQUE BOLTS IN ORDER INDICATED
1
2
3
4
5
6
7
9
Torque this bolt first and last
P108 083E
6
8
8
Charge pump
You may disassemble the charge pump to inspect, clean, or to change the auxiliary shaft drive coupling
(U015). Post 1998 pumps contain a number of non-interchangeable parts within the charge pump
system:
•
Pre-1998 pumps have a gerotor drive coupling with a drive pin for the gerotor element, while post
1998 release pumps will contain a coupling with a parallel drive key. This change also results in a
change to the gerotor set. When servicing the gerotor, these two elements must be placed in
combination. A service kit is available for pre-1998 charge pumps. Refer to service bulletin 1997-029.
•
Post 1998 release pumps also contain a coupling with a retaining ring to positively locate the
coupling in the assembly. This change eliminated the need for a coupling spacer.
•
The outer step on the gerotor cover has been removed on the post 1998 release pumps.
Service Manual
Series 42 Axial Piston Closed Circuit Pumps
Minor Repair
520L0638 • Rev 0300 • July 2015 57