Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
Marysville, Ohio USA
Bulletin HY28-2708-02/SVC/EN | July 2019
Medium Pressure Axial Piston Pumps
P1/PD B-mod Service Information
36
8. Position the pump horizontally and remove the rotating group. Avoid
separating the pistons (#27) from the barrel (#23) if possible. This will assist
in identifying damage between an individual piston and barrel bore during
component inspection.
NOTE: If completing a seal change or complete overhaul on a 45cc pump or
larger, turn the housing over and remove the seal retainer snap ring (#40) and
shaft seal (#39) from the housing before moving to step 9.
NOTE: For shaft change only on 45cc pumps or larger, no further
disassembly is required. Proceed to Step 7 of the assembly procedure.
9. Remove the cam (#29) from the housing by tilting it and carefully extracting it
from the pump housing. See Figure 2.
Pump Disassembly Procedure
(Continued)
Figure 2
Large Pocket
Pressure Control
Side of Pump
10. For sizes 60-140cc remove the front tapered roller bearing cone (#32). If there
is excessive wear or damage, remove the tapered roller bearing cup (#33)
from the bottom of the housing.
11. Remove the cam bearing screws (#30) and two cam bearings (#31).
12. Remove the housing snap ring (#43) and shaft bearing assembly (#32).
13. If completing a seal change or complete overhaul, turn the housing over
and remove the seal retainer snap ring (#40) and shaft seal (#39) from the
housing. For a 45cc pump or larger, this step was already completed as part
of step 8.
14. If there is excessive wear on the port block bearing (#18) (bushing for sizes
18, 28 & 45), remove the bearing or bushing from the port block (#3).
Pump Service Procedures
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