Clarke EXT 311 Operator's Manual download pdf (Page 13)

Page 12 Clarke

Ext -311 Owner's Manual

Maintenance Of The Motor

This machine has a vacuum motor that uses carbon

brushes. The carbon brushes in the motor must be

checked every three months, or every 500 hours of opera-

tion, whichever comes first. If either of the brushes is

shorter than 3/8 inch, replace both of the carbon brushes.

How To Check The Commutator And The Carbon

Brushes

WARNING: Electrical inspections must be made

by a person authorized to make

electrical repairs.

To check the commutator and the carbon brushes follow

this procedure:

1. Disconnect the power cord from the electrical outlet.

2. Remove the dome.

3. Empty both tanks.

4. Remove the pail.

5. Remove the ten screws from the lower housing.

6. Lift the upper housing from the lower housing.

7. Put the machine on its side.

8. Disconnect the ground wire.

9. Remove the two screws from the bottom of the

machine that hold the motor bracket.

10. Remove the plastic motor cover.

11. Inspect the commutator. See figure 11. Take the

machine to a Clarke authorized repair location if you

see any of the following conditions:

a. Small holes in the surface of the commutator.

See "A" in figure 11.

b. Uneven color. Look for an even dark brown color.

Clean areas or very dark areas indicate a problem.

See "B" in figure 11.

c. High mica. The mica insulation must be lower than

the commutator bars. See "C" in figure 11.

12. To check the carbon brush assemblies, remove the

two screws from the holding bracket.

13. Remove the brackets.

14. Remove the carbon brush assemblies.

15. Check the carbon brush assembly. Replace both

carbon brush assemblies if either carbon brush is

shorter than

/8 inch. If either brush is shorter than ½

inch, order replacement brushes. Be ready to replace

both carbon brushes earlier than the normal inspection

time.

16. Put the motor brushes in position.

17. Using the two screws, install the bracket that holds the

carbon brushes.

18. Install the plastic motor cover.

19. Connect the ground wire.

20. Install the motor holding bracket.

21. Install the lower housing to the upper housing.

Figure 11

UNEVEN

GOOD

SMALL

HOLES

GOOD

HIGH MICA

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 56 57

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