OPERATING CONTROLS AND PROCEDURES 18000 OPERATOR MANUAL
3-74
Published 12-05-17, Control # 032-23
Pump Pressure Test
See Figure 3-47 and Figure 3-50 for the following procedure.
The pump pressure line of the calibration screen cycles
through the hoist pumps to make sure each pump is capable
of producing 6,000 psi (414 bar). This test is generally used
only as a shop procedure on new cranes. It can also be used
as a quick way to test hydraulic components in the primary
hydraulic circuits.
CAUTION: This test must be done by a qualified service
technician.
and only when deemed necessary.
To perform pump pressure test, proceed as follows:
1. Turn PARK ON for all crane functions (drums, boom
hoist, swing, travel).
2. Start engine. It is normal for yellow operating limits light
to come on during this procedure.
3. Access calibration screen shown below as follows:
a. Select and confirm SETUP mode to activate
calibration program.
b. Turn LIMIT BYPASS switch clockwise and hold.
c. SCROLL UP at least one screen.
d. Continue to scroll up or down until calibration screen
appears.
e. Press bottom of CRANE MODE switch until (*)
appears next to PRESSURE TEST.
f. Increase engine speed to:
- HIGH IDLE, field personnel.
- 1,350 RPM, MCC assembly personnel when
checking out a new crane.
Engine must be running faster than 750 RPM before
pump pressure test will start.
Pump pressure test will stop if engine speed is
decreased during procedure.
g. Press top end of CRANE MODE switch to
CONFIRM. Testing will start.
h. When testing starts, percent (%) of completion is
displayed on screen.
i. When testing stops, check binary number:
- If 0 appears, all pumps have passed the test.
- If any number other than 0 appears, use Table
3-13 to determine which pumps have failed the
test.
- Each pump is assigned a number in the binary
system (power of two). After running the
pressure test, outputs that are ON (failed) for
any pump, are added together. To identify the
failed pumps, find the binary number displayed
on the screen in the first column of Table 3-13
.
All shaded boxes to the right of the number
indicate pumps that failed testing. Troubleshoot
the particular system to determine the cause of
the fault.
4. Proceed to next procedure, or exit calibration screen by
pressing bottom of CRANE MODE switch. Cursor (*) will
disappear from screen.
WARNING
High Pressure Hazard!
This test generates maximum pressure in the main
hydraulic circuits. Defective brakes may allow unintended
motion during test. Move the crane to an area where such
motion is not a hazard.
Use a signal person to monitor functions operator cannot
see.
Be prepared to stop engine if unintended motion occurs.
To Next Page
Loading...
Need help?
General
