Yanmar 4LHA-HTP User Manual

Chapter 9 Electrical System
3. Starter Motor
, 4LHA Serii
6.2 Field coil
(1) Field coil continuity and ground test.
Field coil continuity test
Field coil insulation test
Kind of test
Check point Normal
Abnormal
Continuity
Terminal
between field coil
YES
NO (Wiring broken)
Insulation
Field coil
between yoke
NO
YES (Short-circuit)
6.3 Brush
(1) Brush dimensions
Replace brushes which have been worn beyond the
specified wear limit.
Replace the brush if it is
wom up to the bottom of
the Hitachi trademark
(approximately one-half its
.original length)
Standard
height
NEW
Wear limit
USED
mm (in.)
S13-41A
Brush standard height
18(0.7087)
Wear limit.
7(0.2756)
(2) Brush appearance and movement in brush holder
If the outside of the brush is damaged, replace it. If the
movement of the brushes in the brush holder is
hampered because the holder is rusted, repair or
replace the holder.
(3) Brush spring
Since the brush spring pushes the brush against the
commutator while the motor is running, a weak or
defective spring will cause excessive brush wear,
resulting in sparking between the brush and the
commutator during operation. Measure the spring
force with a spring balance; replace the spring when
the difference between the standard value and the
measured value exceeds ±0.3kg (0.66 Ib)
Spring balance
Brush spring
Wear limit ± 2.9 (0.3) N(kgf)
(Measuring brush spring force)
S13-41A
Standard spring load
31.4 (3.2) N(kgf)
(4) Brush holder ground test
Check for continuity between the insulated brush holder
and the base of the brush holder assembly. Continuity
indicates that these two (- between +) points are
grounded and that the holder must be replaced.
9-13

Yanmar 4LHA-HTP Specifications

General

Brand	Yanmar
Model	4LHA-HTP
Category	Engine
Language	English