JLG 740AJ, Руководство по обслуживанию и ремонту

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SECTION 5 - BASIC HYDRAULIC INFOR M ATION AND SCHE M ATICS
3121160 5-83
Initial Start-up Procedures
Follow this procedure when starting-up a new pump or when
the pump has been removed.
1. Install the pump on the engine. Ensure the pump shaft is
properly aligned.
INCORRECT SHAFT ALIGNMENT MAY RESULT IN DAMAGE TO DRIVE SHAFT,
BEARINGS, OR SEAL WHICH CAN CAUSE EXTERNAL OIL LEAKAGE.
2. Fill the main pump housing with clean hydraulic fluid.
Pour filtered oil directly into the upper most case drain
port.
3. Fill the inlet line leading from the pump to the reservoir.
Check the inlet line for properly tightened fittings and
be certain it is free of restrictions and air leaks.
4. To ensure the pump stays filled with oil, install the case
drain line in the upper most case drain port.
5. Install a gauge at port M2 to monitor system pressure
during start up.
6. While watching the pressure gauge installed at M2, jog
the engine or run at the lowest possible speed until sys-
tem pressure builds to normal levels (minimum 160psi
(11 bar)). Once system pressure is established, increase
to full operating speed. If system pressure is not main-
tained, shutdown the engine, determine cause, and take
corrective action. Refer to Troubleshooting.
7. Operate the hydraulic system for at least fifteen minutes
under light load conditions.
8. Check and adjust control settings as necessary after
installation. Refer to Adjustments.
9. Shut down the engine and remove the pressure gauge.
Replace plug at port M2.
10. Check the fluid level in the reservoir; add clean filtered
fluid if necessary. The pump is now ready for operation.
Troubleshooting
Table 5-2. Excessive Noise and/or Vibration
Item Description Action
Check fluid level in reservoir. Insufficient hydraulic fluid will cause cavitation. Fill the reservoir to proper level.
Check for air in system. Air in system will cause noisy, erratic control. Purge air and tighten fittings. Check inlet for leaks.
Check pump inlet pressure / vacuum. Improper inlet conditions will cause erratic behavior and
low output flow.
Correct pump inlet pressure / vacuum conditions. Refer to
Hydraulic parameters.
Inspect shaft couplings. A loose or incorrect shaft coupling will cause excessive
noise and/or vibration.
Repair or replace coupling and ensure that correct coupling
is being used.
Check shaft alignment. Misaligned shafts will create excessive noise and/or vibra-
tion.
Correct shaft misalignment.
Hydraulic fluid viscosity above acceptable limits. Hydraulic fluid viscosity above acceptable limits or low
fluid temperature will not allow the pump to fill or control
to operate properly.
Allow system to warm up before operation or use fluid with
the appropriate viscosity grade for expected operating
temperatures.