Invacare M51, M50, M61 Electro-Mechanical Parking Brake Testing, Replacing Motor Brushes

SECTION 12—MOTORS

DETAIL “A” - REMOVE END CAP

End Cap Screws End Cap

Screwdriver to Remove

End Cap Screws (STEP 1) 2-Pole DC Motor

DETAIL “B” - LOCATE MOTOR BRUSH

Spring Retainer

Motor Brush

Brush Housing

Shunt Wire

NOTE: Brush assembly on one side of Motor shown.

DETAIL “C” - REMOVE SHUNT WIRE

Motor Brush

Shunt Wire

Screwdriver to

Remove Shunt Wire

Shunt Wire Mounting Screw Screw (STEP 4)

DETAIL “D” - REMOVE LARGE BRUSH

Screwdriver to Release Tension	Spring Retainer
on Spring Retainer (STEP 5)

Shunt

Wire

Motor

Brush

FIGURE 12.4 Replacing Motor Brushes

Electro-Mechanical Parking Brake Testing

NOTE: For this procedure, refer to FIGURE 12.5 on page 119.

NOTE: This procedure should only be performed on wheelchairs with conventional motor/gearbox assembly.

1.Engage the motor release lever. Refer to Engaging/Disengaging Motor Release Lever on page 114.

2.On the four-pin motor connector, locate the side by side connectors in the black housings.

3.Set the digital multimeter to read ohms.

4.Measure the resistance between the two brake contacts.

•A normal reading is between 45-100 ohms depending on the motor.

•A reading of 0 ohms (W) or a very high reading; i.e., MEG ohms or O.L. (out of limit) indicates a shorted brake or an open connection respectively. If either condition exists, send the motor to Invacare Technical Service for inspection/repair.

Pronto® Series 118 Part No. 1125075