GUARD GP 3157139 - Caterpillar

Hydrostatic Transmission Head Assemblies
Illustration 6 g03170603
Hydrostatic transmission head
To reuse a hydrostatic transmission head, the thrust surface (A) , must have a 0.41 µm (16 microinch) surface roughness. The surface cannot be concave and no more than 0.005 mm (0.0002 inch) convex. Refer to Illustration 6.The head must not be out of flat by more than 0.08 mm (0.003 inch) across the face and cannot be concave. The top and bottom surface of the head must not be out of parallel by more than 0.25 mm (0.010 inch).
Table 9
Use Again Wear Specifications - Head Assemblies
Part No. Standard (new) Head Thickness Minimum Head Thickness Machine Model
3G-1747 93.0 0.25 mm (3.66 inch) 91.48 mm (3.602 inch) 943
1U-2049(1) 88.0 0.25 mm (3.47 inch) 87.39 mm (3.441 inch) 953, 963, 973
4T-4565 88.0 0.25 mm (3.47 inch) 87.39 mm (3.441 inch) 963, 973
9T-7485 88.0 0.25 mm (3.47 inch) 87.39 mm (3.441 inch) 963, 973
(1) When found on 963 and 973 Loaders ONLY, rework head according to instructions provided on Pages 32 and 33 of the December 5, 1984 issue of Service Magazine