GLASS 2600528 - Caterpillar

Illustration 1 g06216225
View of the piston pump (implement) and the pump control valve (implement)
Illustration 2 g03716264
Piston Pump (Implement)
(1) Inlet opening from the hydraulic tank
(2) Control piston
(3) Barrel
(4) Pistons (nine)
(5) Swashplate
(6) Pump drive shaft
(7) Spring for swashplate
(8) Outlet opening to the implement hydraulic system
(9) Pump control valve (implement)The piston pump (implement) is a variable displacement axial piston pump. The implement pump is mounted on the right rear of the transfer case.The implement pump has nine pistons (4). When pump drive shaft (6) turns, barrel (3), the retraction plate, and the slippers turn. The piston ends connect to the slippers. Swashplate (5) does not turn. There is a bearing journal on each side of the swashplate. The two bearing journals are inside bearings which allow movement of the swashplate. Oil flow through the passages in the pistons lubricates the internal components of the pump.When swashplate (5) is at the maximum angle and pump drive shaft (6) is turning, pistons (4) are moved in and out of barrel (3). As the pistons move out of the barrel, the pistons create a vacuum at inlet opening from the hydraulic tank (1). The hydraulic tank pressure is maintained at a sufficient level not to allow cavitation as the oil is drawn into the pump. The oil passes through the inlet opening and into the piston bore in the barrel. As the barrel continues to turn, the pistons are pushed into the barrel as the slippers rotate up the angle of swashplate (5). The pistons push the oil from the piston bore through pump outlet opening to the implement system.When the engine is operating, the pump will produce flow to satisfy the following conditions:
The demand of the implement system
The