Functional Inspection 2

Functional inspection 2 is a mechanical system inspection for both the left and right side gerotor pumps, pistons, and clutch packs and will assist in determining if:

• The clutch pump check valve is in the "open" position.
• The left and right side gerotor pumps have the ability to "pull" fluid from the sump and send a variable and progressive rate of pressurized fluid to the left and right side clutch pack pistons.
• The left and right side pistons will engage the specific side clutch packs at a progressive rate.
• The rear differential has the ability to provide rear wheel torque and override the resistance created by the parking brake assembly.
• There is a mechanical connection between the rear differential ring and pinion, the drive shaft, the transfer case, and the transmission assembly.

Raise the vehicle on a hoist. Lift the vehicle in a manner that will allow all 4 wheels to rotate during testing. Start the engine. The gear shift lever should be in Park. Rotate, by hand and in a forward direction, a rear wheel at a slow rate of speed. Rotation of the wheel should be possible. Rotate, by hand and in a forward direction, the opposite side rear wheel at a slow rate of speed. Rotation of the wheel should be possible. Rotate, by hand and in a forward direction, a rear wheel at a fast rate of speed. A properly operating pump, piston, and clutch pack will activate and create a progressive increase in wheel rotational resistance. Rotate, by hand and in a forward direction, the opposite side rear wheel at a fast rate of speed. A properly operating pump, piston, and clutch pack will activate and create a progressive increase in wheel rotational resistance. Failure to feel a progressive rate of resistance may indicate a "closed" clutch pump check valve, malfunctioning gerotor pump, piston, clutch pack, or valves internal to the unit.