Gear Housing Removal

DOZER PUMP:

Remove the driven gear (item 11) and the

drive gear and shaft (item,12). Inspect for wear. Any

wear on gear hubs, at the drive coupling or in the seal

areas detectable by touch, or In excess of .002 inch

(0,051 mm) necessitates replacement. Any evidence of

scoring, grooving or burring of outside diameter of teeth

or teeth surfaces requires replacement. Wear in the

shaft seal areas indicates oil contamination.

Replacement can only be made by drive and driven

gear set.

Pry the thrust plates (item 5) from the shaft

and cover (item 9) and port end cover (item 1) with a

screw driver. Avoid distorting the thrust plate. Remove

and discard all rubber pocket seals (item 4) and gasket

seals (item 6).

Gear Housing Removal

Lift or pry off the gear housing (item 7). Be

careful not to damage machined surfaces. Inspect the

gear housing for damage or wear. Wear In excess of

.005 inch (0,127 mm) cut-out necessitates replacement

of the housing. Place a straight edge across the

housing bore. If you can slip a .005 inch (0,127 mm)

feeler gauge under the straight edge, replace the gear

housing. Excessive cut-out in a short time period

indicates excessive pressure or oil contamination.

Where the cut-out Is moderate, .005 inch (0,127 mm) or

less, gear housing may be flipped over and reused.

Thrust Plate Removal

The thrust plates seal the gear section at the

sides of the gears. Wear here will allow internal

slippage, that is, oil will bypass within the pump.

Maximum allowable wear is .002 inch (0,051 mm).

Replace the thrust plates If they are scored, eroded or

pitted. Erosion In the center area where the gears mesh

indicates oil contamination. Over-heating results in

discolored thrust plates. Pitting is a sign of cavitation or

oil aeration.

Gear Removal

60-3.4