13
Bleeding the Brake Lines
METHOD ONE
(requires two people)
1. Close all bleed screws
2. Start with the wheel furthest from the master cylilnder. Slip a transparent bleed hose on the bleeder stem and place the other end of
the hose in a clean container which is partially filled with fluid at all times.
3. The first person depresses the brake plunger SLOWLY. This should take 3-5 seconds. Next, the second person opens the bleed screw.
He then closes the bleed screw BEFORE the first person SLOWLY releases the plunger. This should again take 3-5 seconds. Continue
process until there is no evidence of air in the bleed hose.
4. Repeat for remaining wheels working from the longest to the shortest distance from the master cylinder. Top off master cylinder as
needed to prevent reintroducing air into the lines.
METHOD TWO
(one person)
1. Attach bleed hose to rear wheel as in method one. Open bleed screw. SLOWLY depress plunger (3-5 seconds). Repeat until line is air
free. Close bleed screw. Top off master cylinder as needed to prevent reintroducing air into the lines.
Repeat with remaining wheels.
DANGER: Contamination with dirt, water, petroleum products or other materials may result in brake failure or costly repairs.
Adjusting the Brake Master Cylinder
1. Use a 9/16” wrench to remove the (2) 3/8” x 1” serrated hex head bolts and
shield.
2. Loosen the 1/2” nut on the plunger pin. Use a 3/4” wrench.
3. Rotate the plunger rod to adjust. The braking plunger system should have
approximately a 1/4” of play when adjusted for level road travel. For more
aggressive braking action turn the plunger rod counterclockwise. This will
lengthen the assembly. For less aggressive braking action turn the plunger rod
clockwise. This will shorten the assembly.
DANGER: Do not adjust all the play out of the plunger system. This will
cause the brakes to be activated at all times and overheat the drums,
causing failure.
NOTE: This braking system is designed to assist the pull vehicle in braking,
not to take the place of it.
4. Tighten the 1/2” hex nut to keep plunger rod in place.
5. Put the shield back on and tighten both 3/8” x 1” SF hex bolts.
3/8” x 1” Hex Bolt
Shield
Plunger Rod
1/2” Hex Nut
Adjusting the Brakes
The brake adjustment nut is located behind a slot at the bottom of the backing plate. Tighten the nut until you cannot rotate the wheel
by hand, then back off the adjustment 18 to 20 notches.
IMPORTANT: When adjusting drum brakes, rotate the wheel and drum in a forward rotation only.
Summary of Contents for 655
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Page 16: ...16 Tongue Assembly with Brakes...
Page 18: ...18 24 Ton Running Gear 45...