HyHydrdrauaulliic sc syyststem em / R/ Repepaiair ir innststruructctiionons / s / HyHydrdrauaullic ic pupump mp momottor or ALALLL 8.8.3131
Hydraulic pump motor ALLHydraulic pump motor ALL
If there is a If there is a change in the performance of the motor it should be inspected inside. Thechange 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 tcommutator 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 brusIf a brush canh cannot mnot movove freee freely in thly in the brue brush hosh holdelderr. T. To cheo check thick this the brs the brusush hoh holdelderr
must first be released from the brush rocker. The force from the brush springmust 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 thepermitted by the
cable.cable.
•• If a brIf a brush ush is apis apprproacoachinhing thg the ene end of id of its usts useabeable lile life. Tfe. The lehe lengtngth of th of the bhe brusrushes hes musmustt
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 thebetween the
cable and the slot in cable and the slot in the brush holderthe brush holder. The difference should be at least 1 . The difference should be at least 1 mm. Evenmm. Even
if the difference should be slightly larger it is rif 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 brushesReplacing 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. RelReleasease the ce the cablables froes from the tm the termerminainals on tls on the mohe motor (ptor (posos. 1 figu. 1 figurere 8.148.14).).
2.2. ReleaRelease thse the thre through ough bolts bolts from from the rthe rear eear end hend head ad on thon the moe motor (ptor (pos. os. 2 fig2 figureure 8.148.14).).
3.3. LiLift ft ththe me mototor or ouout ot of tf the he trtrucuck.k.
4.4. PlPlacace e ththe me mototor or on on itits ds dririve ve enend.d.
Figure 8.14Figure 8.14
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