Service Manual

HOOK UP NO. 2

TEST A: FLOW TO MOTOR

With the control valve in the run position and the

flow meter in series between the control valve and

the motor, (Fig 8) we can measure the flow to the

motor and compare this reading with the reading

we had previously observed in Hookup No. 1, Test

A. If this reading is now lower, it indicates a prob-

lem in the spool valve or oil leakage past the relief

valve.

TEST B: RELIEF VALVE SETTING

With the control valve set in the run position, we

can close off the restrictor valve to observe the

pressure when the relief valve opens. If this pres-

sure is below specifications, the relief valve should

be checked or repaired.

TEST C: MOTOR EFFICIENCY

If we lock the motor to prevent rotation, there

should be no flow through the motor, and this

should be indicated by the flow meter. If there is

flow and it is above an acceptable level, this indi-

cates leakage through the motor.

Figure 8

NOTES

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