Jlg 40H Service Manual User Manual download pdf (Page 113)

SECTION 3 - TROUBLESHOOTING

3120240 – JLG Lift – 3-1

SECTION 3. TROUBLESHOOTING

3.1 GENERAL.

This section contains troubleshooting information to be

used for locating and correcting most of the operating

problems which may develop in the aerial platform. If a

problem should develop which is not presented in this

section or which is not corrected by listed corrective

actions, technically qualified guidance should be obtained

before proceeding with any maintenance.

Troubleshooting and maintenance information pertaining

to the prime mover (engine) that are not contained in this

manual are contained in the applicable engine mainte-

nance manual.

3.2 TROUBLESHOOTING INFORMATION.

The troubleshooting procedures are listed and defined in

Table 3-1 through 3-6. As an aid to table use, the aerial

platform is divided into six major groups, each covered

separately within this section. These groups are as fol-

lows: platform assembly, boom assembly, turntable

assembly, chassis assembly, hydraulic system and electri-

cal system.

Each malfunction within an individual group or system is

followed by a listing of probable causes which will enable

determination of the applicable remedial action. The prob-

able causes and the remedial action should, where possi-

ble, be checked in order listed in the tables.

It should be noted that there is no substitute for a thor-

ough knowledge of the equipment and related systems.

It should also be recognized that the majority of the prob-

lems arising in the machine will be centered in the hydrau-

lic and electrical systems. For this reason, every effort has

been made to ensure that all likely problems in these

areas are given the fullest possible treatment. In the

remaining machine groups only those problems which are

symptomatic of greater problems of which have more

than one probable cause and remedy are included. This

means that problems for which the probable cause and

remedy may be immediately obvious are not listed in this

section.

The first rule for troubleshooting and circuit that is hydrau-

lically operated and electrically controlled is to determine

if the circuit is lacking hydraulic oil or electrical control

power. This can be ascertained by overriding the bypass

valve (mechanically or electrically) so that oil is available

to the function valve, then overriding the function valve

mechanically. If the function performs satisfactorily, the

problem exists with the control circuit.

3.3 HYDRAULIC CIRCUIT CHECKS.

The first reference for improper function of a hydraulic sys-

tem, where the cause is not immediately apparent, should

be the Troubleshooting Chart. The best place to begin the

problem analysis is at the power source (pump). Once it is

determined that the pump is serviceable, then a system-

atic control of the circuit components, beginning with the

control would follow. For aid in troubleshooting, refer to

the illustrated parts manual for hydraulic diagrams of the

various circuits.Troubleshooting

1 2 ... 108 109 110 111 112 113 114 115 116 117 118 ... 151 152

Comments to this Manuals

No comments

Jlg 40H Service Manual User Manual Page 113

Comments to this Manuals

Related products and manuals for Special machinery Jlg 40H Service Manual