Usage:
D11 (74Z),
D11N (4HK) Track Type Tractors;
776B (6JC),
776C (2TK),
784B (5RK) Tractors;
777B (4YC),
777C (4XJ),
785 (8GB),
785B (6HK),
789 (9ZC),
789B (7EK),
793 (3SJ),
793B (1HL) Trucks;
994 (9YF) Wheel Loaders;
5130 (7TJ, 5ZL),
5230 (7LL) Excavators
The front gear train idler shaft (left or right) and dowel pin must be installed correctly to prevent damage to the gear train or engine block. Misalignment or improper installation of the idler shaft and dowel can result in incorrect backlash causing possible gear damage. These installation precautions should be followed for all machines powered by 3500 Machine Engines. See Illustration 1 for the location of the dowel.
If idler shaft (1) and dowel (4) are not properly aligned, the shaft can push the dowel to deeply into the dowel hole. It is important for the dowel to remain at the proper height (6) above the face of the block. See Illustration 2. If the dowel is pressed in to deeply, the casting material at the bottom of the dowel hole can be cracked or broken.
NOTE: When correctly installed the dowel should not bottom out in the hole.
The dowel should also slide freely inside the hole of the idler shaft. If the dowel fits tightly into the dowel hole, clean the dowel and dowel hole to remove any dirt or nicks. If the dowel still fits tightly, replace the dowel.
Illustration 1. Cross-sectional view of gear train assembly. Idler shaft (1). Thrust washer (2). Front face of block (3). Dowel (4). Front accessory drive housing (5).
Illustration 2. Side and top view showing dowel pin location. Front face of block (3). Dowel (4). Height (6) above face of block should be 40.0 ± 0.5 mm (1.57 ± .020 in).