BELT TENSION
Measure belt deflection at longest belt run. Adjust belt as necessary. See BELT ADJUSTMENT table. Tighten adjuster lock nut to specification. See TORQUE SPECIFICATIONS .
| Application | (1) Deflection - In. (mm) |
|---|---|
| New Belt | .28-.35 (7-9) |
| Used Belt | .35-.39 (9-10) |
| (1) Measure deflection with 22 lbs. (10 kg) of force applied on longest belt run. | |
| (1) | Measure deflection with 22 lbs. (10 kg) of force applied on longest belt run. |
BELT ADJUSTMENT
ROTOR
- Inspect slip ring brush contact surface. If surface is worn or rough, smooth surface with fine emory paper. Measure slip ring diameter. See «SLIP RING DIAMETER»(ref-121719-S24908458522001090500000) table. If diameter is not as specified or brush contact surface is excessively worn or damaged, replace slip rings and/or rotor.
- Resistance across rotor slip rings should be about 3 ohms. (Scheme 10) If resistance is not as specified, replace rotor. Check continuity between each slip ring and rotor core/shaft, individually. (Scheme 11) Continuity should not exist. If continuity exists, rotor coil and/or slip ring is grounded. Replace rotor.
Scheme 10
Scheme 11
| Standard - In. (mm) | Limit - In. (mm) |
|---|---|
| .894 (22.7) | .870 (22.1) |
SLIP RING DIAMETER
STATOR
Ensure continuity is not present between stator coil leads and stator core. If continuity exists, replace stator. Continuity should be present between leads of stator coil. If continuity does not exist, replace stator.
Scheme 12
Scheme 13
BRUSHES
- Measure the length of each brush. (Scheme 14) If wear exceeds the service limit, replace the brush. Each has the service limit mark (A) on it.
- Checking brush for proper pressure using a spring pressure indicator, push the brush into the brush holder until its tip protrudes.08" (2 mm). (Scheme 15) Then measure the pressure of brush spring.
