Service Manual

IMPLEMENT CIRCUIT (Fig 13)

Some machines require hydraulic oil to operate the

implement lift functions. This can be accomplished

by using a larger charge pump. This pump has a

larger displacement of oil than is needed to replen-

ish the oil lost in the drive circuit. The excess oil not

required to replenish the drive circuit, opens and

passes through the charge relief and is directed to

the implement lift valve. At the implement valve the

oil can be directed to a lift cylinder.

NOTE: It is important to realize that the main circuit

must have enough oil flow and pressure supplied to

it to replenish the oil lost in the drive circuit. Should

the main circuit develop excessive leakage, the

charge relief valve will not be opened and no oil will

flow to the implement circuit.

Figure 13

If the lift control lever remains actuated after the lift cylinder is extended, (Fig 14) the flow from the charge

pump is forced through the implement relief valve and will return to the reservoir.

Figure 14