OilGear A2 Series, Service Instructions Manual

© 2019 THE OILGEAR COMPANY - ALL RIGHTS RESERVED

Bulletin 948034A

16

Bulletin 948034A

PUMP SERVICE MANUAL

DRIVE SHAFT GROUP

Check:

• the shaft bearing

(306)

for  galling, pitting,

binding or roughness.

• the rear shaft bushing in valve plate.
• the shaft and its splines for wear. Replace

any parts necessary.

1. Press shaft seal 

(007)

 into the saddle 

(216)

.

2. Align  hole  in  bottom  of  saddle 

(216)

  with  pin

(217)

in housing. Install saddle in housing and

fasten with eight (8) screws 

(225)

.

3. Place  housing  on  a  bench  with  the  mounting

flange side down.

4. Grease  the  back side  of  each  saddle  bearing

(204A

and

 204B)

 and install on the appropriate

side of the saddle 

(216)

.

5. The swashblock is inserted from the valve plate

end.  Insert  swashblock 

(201) 

into  the  pump

housing. Once in place, be sure the swashblock

swivels  in  the  saddle  bearings.  With  new

bearings, swiveling may be stiff and not always

smooth.

If removed,

ASSEMBLY

See

Figures 

and

. Follow the  disassembly 

procedures in reverse for re-assembling the pump. 
During assembly,  install  new  seals  and  O-rings.

Apply a thin film of CLEAN grease or hydraulic

fluid to sealing components to ease assembly. If a 

new rotating group  is  used,  lubricate  thoroughly 

with CLEAN hydraulic fluid. Apply fluid generously 

to all wear surfaces.

Hydrodynamic Bearing

If the hydrodynamic bearing was removed, a new 

one will need to be pressed into the pump housing. 
A special tool is required in order to press the 

bearing in correctly, See Figure 9. From the valve 

plate end, place the new bearing into the pump 

housing. Adjacent to where the bearing will be 

pressed is a slightly larger bore, with a lead-in 

chamfer, see Figure 11. In preparation for pressing, 

insert the bearing into this bore and verify it sits 

flush. Orient the bearing so that the split in the 

bearing is located 90 degrees clockwise from the 

control mounting face, See Figure 10. Insert the 

small diameter end of the pressing tool inside the 

pump housing and into the bearing. Press the 

bearing until the tool becomes flush with the valve 

plate mounting surface.