Gradall XL4000, Руководство пользователя

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IX. IX.
IX. IX.
IX. Hoist Hoist
Hoist Hoist
Hoist V V
V V
Valv alv
alv alv
alve e
e e
e Adjustments Adjustments
Adjustments Adjustments
Adjustments
Move high pressure gauge (10,000 psi) to front hoist test port. Run engine at full RPM, lower boom to ground
and stall hoist. Pressure should be 3,000 - 3,200 psi. Adjust front port relief as required.
See Figure 10.
Move high pressure gauge (10,000 psi) to rear test port. Rotate section regulator adjusting screw clockwise one
and one-half turns. Raise hoist fully up, use procedure for “cracking” pressure. See Page 1. Pressure should be
4,500 - 4,550 psi. Adjust rear port relief as needed.
See Figure 10.
Leave high pressure gauge (10,000 psi) on rear hoist test port. Return section regulator adjusting screw to original
position. Run engine at full RPM and stall hoist up. Pressure should be 4,300 - 4,350 psi. Adjust section regulator
as required.
See Figure 10.
NOTE!
Use stopwatch for this step. Remove high pressure gauge (10,000 psi) from hoist valve. Retract boom fully and place
on ground with an empty bucket. Run engine at full RPM and raise boom from ground to fully up. It should take
3.6 - 4.2 seconds to fully raise boom. If hoist-up speed needs adjusted, remove plug from stroke limiter on front
end cap. Adjust as required.
See Figure 10.
Perform the following test only if doing an inspection, or if hoist performance is in question.
Figure 10
Form No. 29623 2/97
8
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