Brake System Maintenance And Repair; Brake Adjustment - Demco Gravity Flow 550 User Manual

Saltwater, granular fertilizers and other corrosive materials are destructive to metal. To prolong the
life of a braking system used under corrosive conditions, we recommend that the actuator be flushed
periodically with a high pressure water hose. Be sure to re-grease bearings and oil all moving parts
after the unit has dried. At the end of the season, when unit is to be stored, remove the brake drums
and clean inside the brakes. Pack wheel bearings before drum is installed.
backplate Installation
Mount the backplate to the spindle flange. In mounting
the brake, be sure the hydraulic wheel cylinder is at
the top. Brakes are also marked as "RIGHT" and
"LEFT". The brake designated as "LEFT" travels on
the driver's side of the road.
brake line Installation
Use care in forming tubing to avoid sharp bends or
kinks. Use double flare steel tubing to assure tight
leakproof connections. This must be done by a
certified brake shop. Anchor all hydraulic lines at two
foot intervals to prevent chafing and vibration. Use
hydraulic rubber hose at points of flexing. Anchor
hose ends to avoid stress on tubing.
WRoNG
RIGhT (double flare)
WARNING:
To Prevent serious Injury or death

brake Adjustment

Before removing the ground stand jacks, adjust the
brakes. Uni-servo brakes must be adjusted periodically
to assure having brakes when they are applied. Insert
a brake adjusting tool or a screwdriver into the slotted
hole. With the handle up and the bit down and against
the adjusting nut, pull down on the handle. While spinning
the wheel adjust the cog wheel up until you cannot rotate
the wheel forward. Then back off the adjusting wheel
20 notches.
ALWAYS ROTATE DRUM IN DIRECTION OF
FORWARD ROTATION ONLY.
brake drum Maintenance
Brake drums must be reground if abnormal wear is
found, such as brake shoe hitting brake drum once
lining is gone, rivets hitting brake drums and or brake
drums out of round.
allowed 13.060"
1. Attach brake line to master cylinder outlet. Make sure
all connections are tight.
2. Fill the master cylinder from a sealed container of DOT
3 or 4 brake fluid. A pressure type brake bleeder may
be used. If one is not available, you can bleed the
system manually as follows.
3. After the master cylinder has been filled, remove the
flat spring behind the emergency lever. Pull forward
on the lever to pump the master cylinder. Use short
strokes until bubbling stops in the master cylinder.
Bleed the rear axle first. Install bleeder hose on the
bleeder valve on the first wheel with other end of the
hose in a clear container partially filled with brake
fluid.
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NOTE: Maximum diameter
brake set-up