Manitowoc National Crane 1300A Service And Maintenance Manual

HYDRAULIC SYSTEM 1300A
2-20 01-22-2019 Control # 051-08
TROUBLE DIAGNOSIS
The following chart lists malfunctions which may occur
during equipment operation, the possible cause, and the
possible solution. These are not all inclusive but are
designed to help isolate the problem and should be checked
before calling
Manitowoc Crane Care.
CONDITION POSSIBLE CAUSE POSSIBLE SOLUTION
No hydraulic oil flows in
systems.
Low hydraulic oil level Fill reservoir.
Reservoir-to-pump suction lines broken or
restricted. Air entering at suction lines. Pump
not priming.
Check that all connections are tight and there are no
cracks. Clean, tighten, repair, or replace parts as
necessary.
Pump shaft sheared or disengaged.
If drive shaft is damaged or sheared, remove and
repair or replace as necessary
Internal contamination.
Drain, flush with recommended oil mixture, then
drain and refill system with recommended hydraulic
oil.
Slow response.
Low hydraulic oil level. Fill reservoir.
Hydraulic oil temperature too high (thin oil) or
too low (thick oil).
If the temperature is too high, check the cooler
circuit. If the temperature is too low, warm up
system.
Faulty pump section(s). Repair or replace pump section(s) or entire pump.
Pump noise
accompanied by
hydraulic oil foaming in
reservoir.
Low hydraulic oil level Fill reservoir.
Excessive engine speed. Regulate engine speed.
Air entering at suction lines.
Check that all line connections are tight. Tighten,
repair, or replace as needed.
Excessive pressure
buildup.
Circuit relief valve malfunction or set too high.
Pressure check circuit relief and adjust or replace
relief valve.
Restricted pump-to-control valve supply line. Clean, repair, or replace line as necessary.
Specific hydraulic system
(lift, hoist, telescope,
swing) not working.
Leak in system. Repair leak.
Faulty directional control valve. Replace valve.
Troubleshoot circuit with schematic.
Poorly adjusted control in circuit. Adjust hydraulic
component.
Faulty hydraulic cylinder, motor, or valve. Replace faulty component.
No response to control
Crane function power switch off Turn crane function power switch on.
Load too heavy. Check Capacity Chart.
RCL inoperative. Insure RCL is programmed properly and Anti-Two Block/
Overload solenoids are powered.
PTO not engaged. Engage PTO.
Low hydraulic fluid supply. Check and fill as required.
Suction line blocked. Drain tank and hose and remove blockage.
Broken hydraulic pressure line. Replace as required.
Defective hydraulic pump. See Pump Service Manual.
Incorrect relief valve setting. Adjust relief.
Relief valve sticking. Clean relief or replace.
Hydraulic controllers inoperative Check for pilot pressure at main valve bonnets.
Mesh screen in crane manifold clogged (pilot
circuit)
Remove and clean or replace screen.

Manitowoc National Crane 1300A Specifications

General

Brand	Manitowoc
Model	National Crane 1300A
Category	Construction Equipment
Language	English