JLG X20JP - X600AJ Service Manual - Manual (Page 118)

SECTION 3 - CHASSIS & TURNTABLE
3-94 – JLG Lift – 3121623
Malfunction Indication Possible cause Remedial action
Starter turns
too slowly or
is unable to
turn the en-
gine over. Lengthy period of
use without main-
tenance or in severe
conditions. Carbon brushes sticking. Renew carbon brushes
and brush holder guides.
Carbon brushes worn. Renew carbon brushes.
Brush springs too weak,
brushes not making
contact. Renew springs.
Commutator dirty. Clean commutator.
Armature or field coils
defective. Recondition or renew
starter.
Commutator scored or
burned. Recondition or renew
starter.
Starter en-
gages and is
energised,
but engine
turns over
jerkily or not
at all. Lengthy period of
use without main-
tenance, neglect of
electrical system. Battery flat (discharged). Charge the battery.
Insufficient current flow
because of loose or
oxidised connections. Clean battery posts and
terminals, tighten con-
nections.
Carbon brushes sticking. Renew carbon brushes
and brush holder guides.
Carbon brushes worn. Renew carbon brushes.
Drive pinion
does not
engage or
disen gage. Engine turns over
jerkily or not at all. Drive pinion or helical
thread dirty or damaged. Renew drive pinion, re-
condition starter.
Damaged flywheel gear
ring. Remachine or renew
gear ring.
Faulty solenoid switch. Renew solenoid switch.
Return spring weak or
broken. Renew return spring.
Armature or field coils
defective. Recondition or renew
starter.
Commutator scored or
burned. Recondition or renew
starter.
Commutator dirty. Clean commutator.