Cub Cadet Challenger 550, Service Manual

Page: 134 / 255

4‐38
Engine
Inspect the oil pump
1.
Rotor housing
2.
Rotor cover
Look for cracks, wear or damage.
3.
Oil pump operation
Look for smoothness
4.
Inspect the oil strainer (1)
O-Ring (2)
Look for damage or contamination
clean with engine oil.
Measure the oil pump
1.
Tip clearance (a)
Between the inner rotor (1) and the
outer rotor (2)
2.
Side clearance (b)
Between the outer rotor (2) and the
pump housing (3)
3.
Body clearance (c)
Between the outer rotor (2) and the
pump housing (3)
Tip clearance Limit: 0.23 mm
Side clearance Limit: 0.17 mm
Body clearance Limit: 0.24 mm
Measure the crankshaft
1.
Crank width (A)
Crank width 74.95 ~ 75.00 mm
2.
Side Clearance (D)
Big end side clearance
Limit: 1.0 mm (0.0394 in)
3.
Run out (b) (C)
Run out limit (b): 0.03 mm (C): 0.03 mm