HARNESS AS-CAB 2169736 - Caterpillar

Introduction
For Specifications with illustrations, make reference to the SPECIFICATIONS FOR 768B & 772 TRACTORS, 769B & 773 TRUCKS SUSPENSION CYLINDERS, Form No. REG01407. If the Specifications in Form REG01407 are not the same as in the Systems Operation and the Testing and Adjusting, look at the printing date on the back cover of each book. Use the Specifications given in the book with the latest date.Front Suspension Cylinders
Each front wheel is independently suspended by an oil-pneumatic hydraulic suspension cylinder. These cylinders serve as shock absorbers, springs and as steering kingpins.
FRONT SUSPENSION CYLINDER OPERATION ROD RETRACTING
1. Housing. 2. Nitrogen chamber. 3. Rod. 4. Orifices (two). 5. Ball check. 6. Cavity. 7. Cavity. 8. Oil chamber.Housing (1) is fastened securely to the vehicle frame. Rod (3) is free to move up and down inside housing.Damping action is provided by the controlled rate of oil transfer, through orifices (4) and ball check (5), from oil chamber (8) to cavities (6) and (7).When a bump or obstacle is encountered, the wheel is raised, causing the rod to move up into the housing. This compresses the nitrogen in nitrogen chamber (2), forcing oil from chamber (8) into cavities (6) and (7) through the orifices and ball check.
FRONT SUSPENSION CYLINDER OPERATION ROD EXTENDING
1. Housing. 2. Nitrogen chamber. 3. Rod. 4. Orifices (two). 5. Ball check. 6. Cavity. 7. Cavity. 8. Oil chamber.As the bump or obstacle is passed, this action is reversed, and the weight of the wheel and axle plus the nitrogen pressure in chamber (2) forces the rod out of the housing. As the rod moves downward, the oil volume of cavities (6) and (7) decreases and the trapped oil is put under pressure. This pressure oil closes the ball check and forces oil out through the orifices into chamber (8).As the rod extends to near its maximum length, the lower orifice is closed and the amount of oil being transferred to chamber (8) is reduced. Further extension of the rod progressively closes the remaining orifice, reducing further the amount of oil being transferred from cavities (6) and (7) to chamber (8). This progressive reduction of oil transfer slows the rod extension and prevents the rod from bottoming in housing with a shock.Rear Suspension Cylinders
Two oil-pneumatic hydraulic cylinders are mounted between supports on the rear end of the vehicle frame and brackets on the lower part of the differential housing. Each suspension cylinder is located directly behind and in line with each side rail of the frame. A support, which is secured to the front side of the differential housing, is connected to the frame by a ball joint. The two suspension cylinders provide the "spring action" between the rear wheels and the vehicle frame to support the rear end of the vehicle and carry the load.
REAR SUSPENSION CYLINDER OPERATION ROD RETRACTING
1. Rod. 2. Nitrogen chamber. 3. Housing. 4. Cavity. 5. Oil chamber. 6. Ball check. 7. Cavity. 8. Orifice.Rod (1) is secured to the vehicle frame by a pin. Cylinder housing