8-S26
MX5100, WSM
HYDRAULIC SYSTEM
[3] SERVICING
(1) Hydraulic Pump (Power Steering, 3-Point System)
Housing Bore (Depth of Scratch)
1. Check for the scratches on the interior surface of the housing
caused by the gear.
2. If the scratches reach more than half the area of the interior
surface of the housing, replace the pump assembly.
3. Measure the housing I.D. where the interior surface is not
scratched, and measure the housing I.D. where the interior
surface is scratched.
4. If the values obtained in the two determinations differ by more
than the allowable limit, replace the hydraulic pump as a unit.
(Reference)
• Use a cylinder gauge to measure the housing I.D..
W1014649
Clearance between Bushing and Gear Shaft
1. Measure the gear shaft O.D. with and outside micrometer.
2. Measure the bushing I.D. with an inside micrometer or cylinder
gauge, and calculate the clearance.
3. If the clearance exceeds the allowable limit, replace the gear
shaft and the bushings as a unit.
W1029112
Side Plate Thickness
1. Measure the side plate thickness with an outside micrometer.
2. If the thickness is less than the allowable limit, replace it.
W1023443
Depth of scratch Allowable limit
0.09 mm
0.0035 in.
Clearance between
bushing and gear shaft
Factory spec.
0.020 to 0.081 mm
0.0008 to 0.0032 in.
Allowable limit
0.15 mm
0.0059 in.
Hydraulic pump gear
shaft O.D.
Factory spec.
14.970 to 14.980 mm
0.5894 to 0.5898 in.
Hydraulic pump bushing
I.D.
Factory spec.
15.000 to 15.051 mm
0.5906 to 0.5926 in.
Hydraulic pump side
plate thickness
Factory spec.
2.48 to 2.50 mm
0.0976 to 0.0984 in.
Allowable limit
2.40 mm
0.0945 in.
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