3406C (PEEC III) Truck Engine Caterpillar

8N-8259 Idler Gear Assembly

Illustration 1	g00502347

(1) Bearing

Bore in the bearing of the gear after assembly ... 63.602 ± 0.039 mm (2.5040 ± .0015 inch)

Diameter of the bearing surface of the shaft ... 63.500 ± 0.013 mm (2.5000 ± .0005 inch)

(2) Install the bearing from the face of the gear to the following depth. ... 1.5 ± 0.5 mm (.060 ± 0.02 inch)

(3) Gear

Length of the gear ... 50.75 ± 0.05 mm (1.998 ± 0.002 inch)

Length of bearing surface on the shaft ... 51.00 ± 0.05 mm (2.008 ± .002 inch)

(4) Front spacer plate

(5) Rear face of the front housing

4W-3123 Accessory Drive

Illustration 2	g00502348

(1) When the sleeve for 1W-7935 Pump Drive or the adapter for 1W-8585 Auxiliary Drive Group is used, tighten the bolts to the following torque. ... 30 ± 3 N·m (22 ± 2 lb ft)

Note:

(2) Air compressor shaft nut

Use the following procedure to tighten the nut.

1. Tighten the nut.

   Tighten the nut to the following torque. ... 200 ± 25 N·m (150 ± 18 lb ft)

2. Hit the end of the shaft with a hammer. Tighten the nut.

   Tighten the nut to the following torque. ... 200 ± 25 N·m (150 ± 18 lb ft)