Operator's Manual

Page 38 Maintenance Instructions
Belt and Rear Gate Seals
Check all rubber seals for wear or damage. Replace
or repair the seals if any leakage occurs.
Options
Check that the quick-attach brackets are securely
locked into place and that the safety clips are
installed. Replace missing safety clips.
Check that the option is securely clamped and does
not move or slide out. Adjust clamps if required.
Check the paddles on the Twin Spinner disks for
wear. Replace them when they wear thin.
Check the Twin Spinner housing for signs of
cracking or corrosion.
Safety Decals
Check that the safety decals are undamaged and
legible, otherwise replace them.
Electric Brakes
Once a month, conduct a simple visual inspection of
your brake shoes and linings.
Inspect and service your electric brakes once a year
(see procedure below).
Maintaining the Electric Brakes
How to Adjust the Electric Brakes
Adjust the electric brakes after the first three months of
operation, or sooner depending on use or performance.
1. Jack up the MH-400 securely.
2. Ensure that the wheel and drum rotate freely.
3. Remove the adjusting hole cover from the slot on the
bottom of the brake backing plate.
4. With a screwdriver, rotate the star wheel of the
adjuster assembly to expand the brake shoes.
5. Adjust the brake shoes out until the pressure of the
linings against the drum makes the wheel difficult to
turn.
6. Rotate the star wheel in the opposite direction until
the wheel turns freely with a slight drag on the
lining.
7. Replace the adjusting hole cover.
8. Repeat the above procedure on each brake.
Brake Shoes and Linings
Once a month, conduct a simple visual inspection of your
brake shoes and linings.
When a brake shoe becomes worn, replace both shoes on
each brake, and both brakes on the same axle. This
ensures that the brakes remain balanced.
Replace the brake linings when they are:
• worn to 1.6 mm (1/16 in) or less remaining thickness
• contaminated with grease or oil
• abnormally scored or gouged
Hairline heat cracks are normal in the brake linings and
should not cause concern.
Yearly Brake Cleaning and Inspection
Inspect and service your electric brakes once a year or
more often with heavy use or declining performance.
• Change magnets and shoes when they become worn
or scored.
• Clean the backing plate, magnet arm, magnet, and
brake shoes with an automotive brake cleaner.
• Ensure that all parts removed are replaced in the
same brake and drum assembly that they were
removed from.
• Inspect the magnet arm for any loose or worn parts.
• Check the shoe return springs, the hold-down
springs, and the adjuster springs for stretch or
deformation and replace them if required.