Manitowoc National Crane 500E2 User Manual

500E2 OPERATOR MANUAL MAINTENANCE CHECKLIST
6
National Crane Published 07-26-2019 Control # 111-06 6-11
System is in a state of constant cut-
out (continued)
Load cell not calibrated.
To set the zero point, remove all force from
the load cell. Remove the electronics from
the housing. Set the switch position 8 to ON.
Power the system. Do not turn off power
until both the zero point and the gain have
been set. To set the zero point, press the
button on the board. To set the gain, set
switch position 8 to OFF. Set the switch to
the correct code that matches the load cell
gain. This code can be found on the tag that
accompanies the load cell. Press the button.
System cuts out too early or too late
Wrong table selected.
Check to see which table is selected using
the single character display. If the wrong
table is selected, select the proper table
using the procedure in the system
installation section.
Single sensor not zeroed.
Ensure that the electronics box is tightly
mounted to the jib. Zero the angle sensor
using the procedure in the system
installation section.
Configuration switch stuck open or closed
(two section jibs only).
Configuration switch must be closed when
the jib is Retracted and open when the jib is
extended. Adjust or replace switch As
necessary.
Pivot pin not free to move.
Ensure that pivot pin is free, well lubricated,
and allows the jib head to pivot freely.
Inspect and replace bearings in jib head
assembly as required.
Foreign object stuck between jib head
assembly and jib. The only contacts
between the jib head assembly and the
jib are to be the load cell and the pivot pin.
Remove any foreign objects which interfere
with jib head assembly operation.
Jib Jack Troubleshooting
Will not lift load
No oil in system
Release valve not closed
Add oil to reservoir tank through oil filler hole
Turn handle clockwise tightly
Will lift load only part way Oil level low Add oil to reservoir tank through oil filler hole
Will lift load but will not hold
The following valve or valves leaking
• Suction valve
• Delivery valve
• Release valve
Replace jack
Packings worn or damaged Replace jack
Jack will not lower
Release valve stuck, probably dirt or
foreign matter
Transfer load then replace dirty oil, flush oil
reservoir with kerosene
Poor lifting
Dirty oil
Air in hydraulic system
Change hydraulic oil
Purge air from system
Poor pumping action
Oil seal for pump unit worn in out or
damaged
Replace jack
Condition Possible Cause Possible Solution

Manitowoc National Crane 500E2 Specifications

General

Brand	Manitowoc
Model	National Crane 500E2
Category	Construction Equipment
Language	English