D-Series Syringe Pumps - Isco

D Series Syringe Pumps
Section 5 Pump Maintenance & Repair
5.9 Motor Brush
Replacement
The motor brushes will require inspection approximately every
two years of operation or 6,000 strokes (whichever comes first).
The normal length of a new brush is 1.1 cm. The brushes should
be replaced before they reach 0.4 cm. Only one brush needs to be
checked. The other brush will wear at about the same rate. We
recommend checking the top brush, as it is much easier to
remove and replace.
The upper brush may be removed with the unit in the upright
position. The lower brush, which is difficult to remove, is
accessed through a hole on the case bottom. While not a preferred
method, the lower brush can also be removed by first
removing the gear train from the case bottom.
DANGER
RISK OF ELECTRIC SHOCK -
DISCONNECT THE ELECTRIC POWER BEFORE
SERVICING. ONLY TRAINED SERVICE
PERSONNEL MAY REMOVE THE CASE TOP.
DANGER
RISQUE DE CHOC ÉLECTRIQUE.
COUPER L´ALIMENTATION AVANT LA
RÉPARATION. L´USAGER NE DOIT PAS
DÉMONTER L´INSTRUMENT OU DÉRANGER LE
MÉCANISME DEDANS. ADRESSER LA
REPARATION SEULEMENT AUX TECHNICIENS
COMPÉTENTS.
To remove the top brush 1. Remove the pump case top as detailed in Section 5.1.3.
2. Locate the upper brush, Figure 5-7 (Configuration 1 or 2,
depending on your pump motor type).
3. Remove the wire lead by pulling on the quick disconnect.
4. Unscrew the brush retainer from the motor using a
straight edge screwdriver.
5. Once the wire has been removed, pull the brush out.
To replace the top brush
To remove the bottom brush
1. Guide the new brush into the slot.
2. Push the spring down and the replace the brush retainer.
3. Tighten the brush retainer with a straight-edge screwdriver.
1. If you have not already done so, remove the pump case top.
2. Lay the pump on its back so that you can access the hole in
the case bottom. Remove two screws which secure a cover
plate over the access hole.
3. Remove the wire lead by pulling on the quick disconnect.
5-14