SERVICE MANUAL A-ERGO
SERVICE MANUAL A-ERGO
Hy
Hydr
drau
aulliic s
c sy
yst
stem
em / R
/ Rep
epai
air i
r in
nst
stru
ruct
ctiion
ons /
s / Hy
Hydr
drau
aullic
ic pu
pump
mp mo
mottor
or AL
ALL
L
8.
8.31
31
Hydraulic pump motor ALL
Hydraulic pump motor ALL
If there is a
If there is a change in the performance of the motor it should be inspected inside. The
change in the performance of the motor it should be inspected inside. The
brushes are one of the most common sources of a fault.
brushes are one of the most common sources of a fault.
The brushes can become worn out, or stick
The brushes can become worn out, or stick in their holders. In both cases inadequate con-
in their holders. In both cases inadequate con-
tact between the brushes and the
tact between the brushes and the commutator can lead to serious damage to t
commutator can lead to serious damage to the commu-
he commu-
tator surface.
tator surface.
When should the brushes be replaced?
When should the brushes be replaced?
••
If a brus
If a brush can
h cannot m
not mov
ove free
e freely in th
ly in the bru
e brush ho
sh holde
lderr. T
. To che
o check thi
ck this the br
s the brus
ush ho
h holde
lderr
must first be released from the brush rocker. The force from the brush spring
must first be released from the brush rocker. The force from the brush spring
should then press out the brush from the brush holder as far as
should then press out the brush from the brush holder as far as permitted by the
permitted by the
cable.
cable.
••
If a br
If a brush
ush is ap
is appr
proac
oachin
hing th
g the en
e end of i
d of its us
ts useab
eable li
le life. T
fe. The le
he lengt
ngth of t
h of the b
he brus
rushes
hes mus
mustt
never be less than 10 mm (a new brush has a
never be less than 10 mm (a new brush has a length of 17 mm). Since this is diffi-
length of 17 mm). Since this is diffi-
cult to measure,
cult to measure, there is another alternative. Measure the difference
there is another alternative. Measure the difference between the
between the
cable and the slot in
cable and the slot in the brush holder
the brush holder. The difference should be at least 1
. The difference should be at least 1 mm. Even
mm. Even
if the difference should be slightly larger it is r
if the difference should be slightly larger it is recommended to replace the brushes,
ecommended to replace the brushes,
since their residual service-life may be shorter than the time to the
since their residual service-life may be shorter than the time to the next inspection.
next inspection.
Replacing the brushes
Replacing the brushes
The actual brushes cannot be replaced since they are
The actual brushes cannot be replaced since they are included in a set consisting of
included in a set consisting of brush,
brush,
brush holder and spring. These can be
brush holder and spring. These can be installed as follows.
installed as follows.
1.
1.
Rel
Releas
ease the c
e the cabl
ables fro
es from the t
m the term
ermina
inals on t
ls on the mo
he motor (p
tor (pos
os. 1 figu
. 1 figure
re 8.14
8.14).
).
2.
2.
Relea
Release th
se the thr
e through
ough bolts
bolts from
from the r
the rear e
ear end he
nd head
ad on th
on the mo
e motor (p
tor (pos.
os. 2 fig
2 figure
ure 8.14
8.14).
).
3.
3.
Li
Lift
ft th
the m
e mot
otor
or ou
out o
t of t
f the
he tr
truc
uck.
k.
4.
4.
Pl
Plac
ace
e th
the m
e mot
otor
or on
on it
its d
s dri
rive
ve en
end.
d.
Figure 8.14
Figure 8.14
1
1
3
3
5
5
2
2
4
4
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