12H, 140H, 143H, 160H and 163H Motor Graders Hydraulic and Steering System Circle Drive Caterpillar


Circle Drive
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Illustration 1g01393833

Top view

(1) Gerotor motor (circle drive)

(2) Lightly lubricate the O-ring seal with the lubricant that is being sealed.

(3) As required, use the following shims in order to obtain the preload on bearings (4) . Bearing preload is 0.00 to 0.13 mm (0.000 to 0.005 inch).

7D-8983 Shim ... 0.18 mm (0.007 inch)
7D-8984 Shim ... 0.13 mm (0.005 inch)



Illustration 2g01393888

Side view

(5) Lightly lubricate the O-ring seal with the lubricant that is being sealed.

(6) Before assembling the worm gear to the shaft, heat the worm gear to the following temperature. ... 150 °C (302 °F)

(7) The rubber toric seals and all the contacting surfaces must be clean and dry at assembly. Just before assembly, apply a thin layer of oil to the contacting surfaces of the metal seal rings. The seal rings must be assembled square. The bore should not bulge and the bore should not be twisted. The rubber toric seal should not bulge and the rubber toric seal should not twist.

(8) Torque for four taperlock studs ... 55 ± 10 N·m (41 ± 7 lb ft)

(9) Torque for four full nuts ... 430 ± 60 N·m (320 ± 44 lb ft)

(10) Torque for taperlock studs ... 150 ± 20 N·m (110 ± 15 lb ft)

(11) Lightly lubricate the O-ring seal with the lubricant that is being sealed.

(12) Torque for nut ... 325 ± 27 N·m (240 ± 20 lb ft)

Information System:

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