STEERING
L3301, L3901, L4701, WSM
7-S22
[2] L4701
(1) Hydraulic Pump
Housing Bore (Depth of Scratch)
1. Check for the scratch on the interior surface of the housing
caused by the gear.
2. If the scratch reaches more than half the area of the interior
surface of the housing, replace at 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.
9Y1211012STS0028US0
Clearance between Bushing and Gear Shaft
1. Measure the gear shaft O.D. with and outside micrometer.
2. Measure the bushing I.D. with and 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.
9Y1211012STS0029US0
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.
9Y1211012STS0030US0
Depth of scratch Allowable limit
0.09 mm
0.0035 in.
Clearance between
bushing and gear shaft
Factory specification
0.020 to 0.081 mm
0.0008 to 0.0032 in.
Allowable limit
0.15 mm
0.0059 in.
Gear shaft O.D. Factory specification
14.970 to 14.980 mm
0.5894 to 0.5898 in.
Bushing I.D. Factory specification
15.000 to 15.051 mm
0.5906 to 0.5926 in.
Side plate thickness
Factory specification
2.48 to 2.50 mm
0.0976 to 0.0984 in.
Allowable limit
2.40 mm
0.0945 in.
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