1. INSPECT VANE PUMP SHAFT AND BUSH IN VANE PUMP FRONT HOUSING

(a) Using a micrometer, measure the outer diameter [a] of the vane pump shaft.

(b) Using a vernier caliper, measure the inner diameter [b] of the vane pump front housing bush.

(c) Calculate the oil clearance.

Oil clearance = Inner diameter of the bush [b] - Outer diameter of the shaft [a]

Maximum oil clearance:

0.07 mm (0.00275 in.)

If the oil clearance exceeds the maximum, replace the vane pump assembly.

2. INSPECT VANE PUMP ROTOR AND VANE PUMP PLATE

(a) Using a micrometer, measure the thickness of the vane pump plates. Standard thickness: 1.405 to 1.411 mm (0.0553 to 0.0556 in.) If the thickness is not as specified, replace the vane pump assembly.

(b) Using a feeler gauge, measure the clearance between the side face of the vane pump rotor groove and the vane pump plate. Maximum clearance: 0.03 mm (0.00118 in.) If the clearance exceeds the maximum, replace the vane pump assembly.

3. INSPECT PRESSURE PORT UNION

(a) Visually check the pressure port union for fluid leaks. If there is a leak, replace the vane pump assembly.

4. INSPECT TOTAL PRELOAD

(a) Check that the pump rotates smoothly without abnormal noise.

(b) Temporarily install the service bolt.

Recommended service bolt:

(c) Using a torque wrench, measure the pump rotating torque. Standard rotating torque: 0.3 N*m (3 kgf*cm, 2 in.*lbf) or less If the rotating torque is not as specified, check the vane pump housing oil seal.