Allis-Chalmers 2900 Mark II — Oil Pump Assembly and Installation
Repair & overhaul
For the Allis-Chalmers 2900 Mark II, from the Allis-Chalmers service manual.
Before you start
- Make certain pump turns freely without binding before installing it on engine.
Procedure
- Install idler shaft and gear in pump housing. Install drive shaft and gear in housing. Lubricate shafts and gears and install gasket and cover on pump housing. Secure cover with capscrews. Torque caps
- Heat drive gear in oil to a temperature of 400 degrees F. (204 C) and press gear onto drive shaft until there is a clearance of .04" - .06" (1,01 -- 1,52 mm) between gear and pump housing face.
- Install relief valve components in pump cover as shown. Secure with spring pin.
- Make certain pump turns freely without binding before installing it on engine.
- Place pump in position on cylinder block and secure with capscrews and lockwashers. Tighten capscrews to a torque of 28 - 32 lbs. ft. (3,87 - 4,42 kg/m).
Specs & values
- Oil pump cover capscrews torque: 18 - 20 lbs. ft. (2,48 - 2,76 kg/m)
- Drive gear heating temperature: 400 degrees F. (204 C)
- Drive gear to pump housing face clearance: .04" - .06" (1,01 -- 1,52 mm)
- Oil pump mounting capscrews torque: 28 - 32 lbs. ft. (3,87 - 4,42 kg/m)
Source: Allis-Chalmers service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.