Yard Machines Y60 Operations Instructions download pdf (Page 106)

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101

Figure 4-73. Hydraulic System Pressure Check

Figure 4-72. Fuses and Underdash Wiring

4-63. ELECTRICAL WIRING, SWITCHES,

AND FUSES.

a. The wiring system on the vehicle is a 12-volt

negative ground system. Extreme care must be

taken when connecting an outside source of power

to any component for test purposes, to observe the

proper ground polarity.

Disconnect battery ground strap before

performing any service on electrical system.

b. Wiring circuitry and color codes are indicated

on the electrical schematic, figure 1-3.

c. Be sure to replace all light bulbs and

instruments with parts rated for 12-volt operation.

d. Access to the fuses may be gained through

removal of the underdash cowling. Fuses are

identified in figure 4-72.

4-64. HYDRAULIC SYSTEM CHECKS.

4-65. PRESSURE CHECK. The hydraulic relief

valve setting may be checked with a Mico

Quadrigage (Clark Part No. 1800106) or, by

installing a conventional pressure gauge with a

0-4000 psi scale at the discharge (pressure) line of

the hydraulic pump or at the hydraulic valve. See

figure 4-73.

a. Connect the pressure line from the gauge to

the test port of the pump or valve by removing

plug from test port.

b. Apply parking brake. Start engine and operate

at governed RPM. Hold tilt lever back until the

pressure builds up and moves the pressure relief

valve off its seat; avoid holding the tilt lever longer

than is necessary to check pressure reading of

gauge. Take reading then release accelerator and

tilt lever.

c. The pressure reading will indicate the setting

of the relief valve. If reading taken is not

reasonably close to those listed in specifications,

appropriate repairs should be made. Report to

designated authority.

4-66. HYDRAULIC CIRCUIT FLOW TEST.

If a

Schroeder Hydraulic Circuit Tester (Clark Part No.

1800060) is available, the hydraulic relief valve

setting and the rate of flow being delivered by the

hydraulic pump may be checked as follows:

a. Connect the pressure line from the tester to the

test port at the hydraulic pump, or at the test port

of the hydraulic valve. Remove sump tank breather

and insert the return line from the tester into the

sump tank.

4-50

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Yard Machines Y60 Operations Instructions Page 106

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