HyHydrdrauaulliic sc syyststem em / R/ Repepaiair ir innststruructctiionons / s / HyHydrdrauaullic ic pupump mp momottor or ALALLL 8.8.3333
Tips to prolong the service-life of the motorTips to prolong the service-life of the motor
•• RapRapid wid wear oear of bruf brushshes aes and cnd commommutautator tor is ois ofteften can causeused by d by oiloil. Oi. Oil or gl or grearease ise iss
burned by the sparks that develop at the burned by the sparks that develop at the brushes, which leaves a residue of abrasivebrushes, which leaves a residue of abrasive
ash. If oil or grease is ash. If oil or grease is found in the motor the cause of this must be efound in the motor the cause of this must be eliminatedliminated
immediately.immediately.
•• NevNever over overlerload oad the mthe motootorr. Bru. Brushshes thes that havat have beee been intn intensensely oely oververheaheated eted expaxpandnd
permanently and can fasten in the permanently and can fasten in the brush holders.brush holders.
•• The The lifelifespaspan of tn of the bhe brusrushes hes not onot only dnly depeepends onds on thn the loe load, bad, but aut also olso on hon how worw worn then the
commutator is. The commutator should have a commutator is. The commutator should have a smooth, level, greyish-black sur-smooth, level, greyish-black sur-
face. A worn cface. A worn commutator must be machined (never use abrasive paper, a whetommutator must be machined (never use abrasive paper, a whet
stone or file!) to a surface fstone or file!) to a surface fineness of ineness of Ra = 0.8-1.8 Ra = 0.8-1.8 µµm and a maximum m and a maximum offset ofoffset of
0.03 mm (with the rotor 0.03 mm (with the rotor resting in the bearing seats). For the service-life of theresting in the bearing seats). For the service-life of the
commutator it is better to machine it a little and more often, than seldom and a lot.commutator it is better to machine it a little and more often, than seldom and a lot.
The minimum diameter of the commutator is 40.8 mm.The minimum diameter of the commutator is 40.8 mm.
•• The mThe mototor muor must nost not be et be expoxposed tsed to fulo full loal loadinding img immedmediatiately aely aftefter chr changanging ing thethe
brushes.brushes.
•• LooLook for sk for signigns of os of oververheaheatinting on thg on the wine windindings, dgs, dark ark patpatcheches, bs, brittrittle ole or burr burned ined insnsu-u-
lation, and damage to lation, and damage to the soldering on the commutator. If the motor is damaged inthe soldering on the commutator. If the motor is damaged in
this way it is no lthis way it is no longer serviceable.onger serviceable.
•• If poIf possssibleible, rem, remove ove dusdust ant and dird dirt frot from the im the insnside oide of the mf the motootor witr with comh comprepressessed aid airr..
•• A dirtA dirty coy commummutattator sor shouhould alld alwayways be cs be clealeaned wned with ith a clea clean clan cloth oth moimoiststeneened wid withth
petrol (do not use waste cotton since it sheds fibres), and carefully blown cleanpetrol (do not use waste cotton since it sheds fibres), and carefully blown clean
with compressed air.with compressed air.
•• If the bIf the bearearing bing brasrass los looks aoks as if it as if it are oure out of ot of oil (iil (i.e. v.e. very ery littlittle oile oil can l can be sebe seen oen on then the
rotor washer or on the brush holder) lubricate it rotor washer or on the brush holder) lubricate it with a little bearing grease.with a little bearing grease.
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