J&M PRO 450 - Manual (Page 18)

18
SERVICE
Brake Drum Inspection:
There are two areas of the brake drum that are subject to wear and require inspection. These two areas are the
drum surface where the brake shoes make contact during stopping and the armature surface where the magnet
contacts (only in electric brakes).
The drum surface should be inspected for excessive wear or heavy scoring. If worn more than .020” oversized,
or if the drum has worn out of round by more than .015”, then the drum surface should be turned. If scoring or
other wear is greater than .090” on the diameter, the drum must be replaced. When turning the drum surface,
the maximum re-bore diameter for a 12” brake drum is 12.090”
The machined inner surface of the brake drum that contacts the brake magnet is called the armature surface.
If the armature surface is scored or worn unevenly, it should be refaced to a 120 micro inch finish by remov-
ing not more than .030” of material. To insure proper contact between the armature face and the magnet face,
the magnets should be replaced whenever the armature surface is refaced and the armature surface should be
refaced whenever the magnets are replaced.
2.6 Daily Service (5 -10 Hours of Use)
NOTE: J&M recommends the following service to be performed daily (every 5-10 hours of
use)
1. Grease the auger bearing every 10 hours. Use only two pumps of grease per bearing
NOTE: Over lubrication of this bearing will result in premature failure.
2. Check hydraulic oil level.
3. Inspect for oil leaks and repair as appropriate.
4. Check all hoses, fittings, bolts, and hardware to make sure that they are secure and properly tightened.
5. Check engine oil level. See Engine operator’s manual for details on oil levels, oil types and service
intervals.
6. Check Speed Pro brakes and lights before towing.
7. Check the Speed Tender periodically for cracks in welds and for other structural damage. Have cracked
welds fixed immediately.
NOTE: Failure to have cracked welds fixed immediately could result in extensive damage to
the Speed Pro and greatly reduce its life.
8. Make sure tires are properly inflated (See section 2.3).
9. Make sure wheel lug nuts are properly torqued (See section 2.4).
10. Clean out the Auger at the end of every day of use (Section 1.8).
2.7 End of the Year Service
IMPORTANT: When the Speed Pro is not going to be used for a length of time, J & M recommends
that you store the Speed Pro in a dry, protected place. Leaving your Speed Pro outside and open to the
weather will shorten its life.