LINES GP-FUEL 1968064 - Caterpillar

Operation
Air from the vehicle supply goes into the air operated hydraulic piston pump (4). A reservoir (6) of oil is in the end cover of the pump. The pump sends oil out through the pressure port to the weight adjustment valve (3). When the valve is open by moving the weight adjustment lever (2), oil from the pump will be sent to the cylinder (5) and to the accumulator (8) or, the oil will return to reservoir (6) from the cylinder. The seat then moves to the center or RIDE position.When the weight adjustment valve is closed, oil moves between the cylinder and accumulator as the seat moves up and down. A ride control valve (7) between the cylinder and accumulator permits the operator to make a setting for his desired hardness of ride.Cylinder
The cylinder assembly moves the weight on the seat through the oil to the nitrogen in the accumulator, which is the spring for the system.
SEAT CYLINDER
1. Ball and socket assembly. 2. Cylinder rod. 3. Line to accumulator. 4. Line from weight adjustment valve.The cylinder rod (2) does not have a piston on the end inside the cylinder. The rod fills almost all of the chamber in the cylinder. When the weight adjustment valve is closed oil can only be sent out through line (3) to the accumulator.A ball and socket assembly (1) is on the top of the rod where the rod is connected to the seat bottom. The ball and socket assembly has a fitting for lubrication. This provides a flexible junction so the seat can move up and down freely.Accumulator
ACCUMULATOR
1. Charging valve. 2. Nitrogen charged chamber. 3. Oil passage. 4. Piston. 5. Oil filled chamber.The accumulator is horizontal across the front of the seat linkage. It is a sealed unit. A piston (4) moves in the bore of the accumulator and keeps the dry nitrogen charge separate from the oil.A charge of dry nitrogen gas at 95 5 psi (6.7 0.4 kg/cm2) is put into chamber (2) through valve (1). Oil from the cylinder under the seat comes in port (3) into chamber (5). This oil pushes piston (4) toward the nitrogen and puts more compression on it. The more oil in the accumulator causes more pressure of the nitrogen charge. When the weight adjustment valve is opened, the correct amount of oil for the weight of the operator goes into the accumulator. The pressure in the dry nitrogen then gives the correct spring for that operator.Ride Control Valve
RIDE CONTROL VALVE
1. Variable orifice valve. 2. Lever.The ride control valve is a variable orifice valve (1). When the lever (2) is turned down to the stop, there is a maximum flow of oil between the cylinder and the accumulator. This gives the operator a soft ride. When the lever is turned up, the flow of oil is less and the ride is harder.Height Adjustment
The height adjustment is a mechanical adjustment. There are three height positions. When lever (1) is pushed forward, rack