National Crane Published 12-21-2011 CTRL #050-09 6-7
1300A OPERATOR’S MANUAL MAINTENANCE CHECKLIST
Tire Load And Inflation Table
Definite tire inflation pressures are established for each tire
size depending upon the load imposed on the tires. For
greater stability, riding comfort and prolonged tire life, tires
should be inflated for the loads carried. The "Load and
inflation Table" shown below indicates the proper inflation
pressure.
System is in a state of
constant cut-out.
Blown fuse.
Check fuse at crane cab console. Replace if
necessary.
ATB switch open. Ensure that ATB switch is closed.
System cuts out too early or
too late.
LMI programmed wrong. Reprogram LMI with correct lift values.
Jib Jack Troubleshooting
Will not lift load.
No oil in system.
Release valve not closed.
Add oil to reservoir.
Turn handle clockwise tightly.
Will lift load only part way. Oil level low. Add oil to reservoir tank.
Will lift load but will not
hold.
The following valve or valves leaking.
a. Suction valve
b. Delivery valve
c. 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 non-flammable solvent.
Poor lifting.
Dirty oil.
Air in hydraulic system.
Change oil.
Purge air from system.
Poor pumping action.
Oil seal for pump unit worn out or
damaged.
Replace jack.
Condition Possible Cause Possible Solution
Tire and Load Inflation Tables
Tire load and inflation tables tire and rim association standard tire loads at various inflation
pressures. Load range letters and corresponding ply rating.
D = 8 ply • E = 10 ply • F = 12 ply • G = 14 ply
H = 16 ply • J = 18 ply • L = 20 ply • M = 22 ply • N = 24 ply
Reference Only
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