SERVICE TIP

Check the oil level when the drive is installed and weekly thereafter (until experience dictates otherwise). Always check the oil level with the unit stationary (not running). NOTE: Oil gauge #46 and pipe plug #75 (Figure 1) may be reversed so that level is visible from other side.

Figure 1 (click to view larger image)

Every three (3) months remove drain plug #74 from end housing #9 and pipe cap #67 at bottom of housing #8 (Figure 1). Drain all oil before refilling. More frequent oil changes may be required on high kinetic energy applications or in extremely dirty environments.

Check the oil sight gauge #46 for dirt. Remove and clean if necessary. Replace the drain plugs. Refill unit with clean oil up to the center of the sight gauge.

CAUTION: Do not overfill with oil. Excess oil will cause the unit to overheat.

Use Automatic Transmission Fluid, Mobil ATF-210 (type F) or Mobil Multi-Purpose ATF.

WARNING: Make Operational Checks ONLY when the drive motor and motor brakes are NOT IN OPERATION. Open motor disconnect and LOCK IT OUT to avoid personal injury.

1. If automatic controls are used, make provisions for manual operation.
   
   
2. Remove air breather #45 and reducer bushing #76 from end housing #9 (Figure 1). Do not remove while motor is operating.
   
   
3. Apply 60 PSI air pressure to the brake and observe the action of the piston through the air breather port. If the piston action is irregular, or if it tends to stick or bind, internal damage may be indicated.
   
   
4. Listen and look for air bubbles in the oil which would indicate piston leakage.
   
   
5. If the piston moves slowly and leaks are evident, the piston seals may be damaged.
   
   
6. Exhaust the air pressure and observe that the piston returns quickly and smoothly back to normal braking position.
   
   
7. Re-install the reducer bushing #76 and the air breather #45 back into the end housing #9 (Figure 1).

Posted 6 August 2001