Spray Painting Procedure
1. Fully apply brake actuator.
2. Plug master cylinder outlet port (1/8" NPTF Thread).
3. Plug master cylinder reservoir port to prevent paint from entering the master cylinder.
4. Paint brake actuator.
5. Fully release brake actuator and paint unpainted portions of socket assembly.
6. Remove all plugs.
7. Inspect for paint contamination of master cylinder and shock absorber shaft after
painting. Replace parts if contaminated with paint.
Mandatory Functional Check After Painting
1. Check the function of the ball socket and latching mechanism by inserting, locking, and
removing a 2" diameter hitch ball. Once the hitch ball is fully inserted in the
socket, the release handle must close completely and freely when released.
2. If the ball socket and latching mechanism does not close completely and freely as
described above:
a. Check for paint build-up in ball socket and clean if necessary.
b . Lubricate ball socket and latching mechanism with SAE 30 oil and work mechanism by
inserting, locking and removing a 2" diameter hitch ball until latching mechanism
does work freely.
3. Move the back-up lever to the indicated back-up position and lock. Operate brake
actuator, back-up lever must return to the towing position freely using only the return
spring force. Clean off excess paint and lubricate as necessary to ensure lever assembly
operates freely.
CAUTION: If locking mechanism does not operate freely, do not
use actuator, contact Atwood Service Department.
FOUNDATION BRAKES
1. Check to see if axle has brake flanges (if so, skip step No. 2).
2. If axle does not have brake flanges, install flanges as follows:
a. Secure flange to back of brake assembly with 4 bolts (Figure 5).
b. Insert brake assembly into hub and drum assembly (Figure 5). Drum must completely
cover surface of brake shoes (Figure 6). Be certain that brake assembly back plate does
not contact drum edge, and that inside edges of shoes are not in contact with hub or drum.
c. Adjust brake shoes snugly against drum by inserting brake adjusting tool through
adjusting slot (Figure 7). Back plate must be centered within drum diameter after
adjustment. (Visually check for equal space between edge of back plate and edge of drum).
d. Mount brake/drum/flange assembly on spindle and secure with spindle nut. Be sure
brake/drum/flange assembly is fully mounted on the spindle.
e. With trailer in a level attitude, locate top of brake flange parallel with bottom of
trailer frame (Figure 8).
f. Tack weld flange to axle (a tack weld is a small semi-permanent weld used for
securing).
g. Remove brake/drum assembly: first back off (loosen) brake adjustment, remove drum, then
remove brake.
h. Finish welding flange securely to axle, using 5/32" fillet weld, No. E6011 A.W.S.
welding rod (AC or DCRP). Use a 5/32" diameter rod, machine amps at 140-150 with 50
volts.
3. Mount brake and shoe assembly to flange. Wheel cylinder must be at top of brake with
rubber boot toward the front of trailer. For 7" brakes use nuts and lock-washers
provided (torque to 50 ft. lbs.).
4. Mount drum and bearings on axle spindle and secure with washer and spindle nut.
5. Tighten spindle nut securely and then loosen (or un-tighten) nut one quarter (1/4) turn
(900).
6. Consult the installation instructions to connect the brake piping.
NOTE: Consult the Atwood Engineering Department when using
non-Atwood brake piping or other components or when questions arise concerning
installation or application.
Raise one trailer wheel at a time, remove dust clip from adjusting slot at lower part of
back side of brake assembly and insert brake adjusting tool (Figure 7). Adjust brake shoes
out by moving end of adjusting tool as illustrated., only until wheel will not turn. When
this condition is felt by rotating wheel, back-off (loosen) adjustment 5 notches. If wheel
still does not rotate freely, apply pressure to brakes to expand shoes against drum and
center shoes. Release pressure and check to see if wheel rotates freely. If not, repeat
procedure from above.
8. Check that all hydraulic fittings are secure.
9. Remove master cylinder filler cap and fill the reservoir with DOT 3 automotive brake
fluid.
10. At brake assembly, connect a bleeder hose to bleeder fitting on wheel cylinder and
submerge free end in a container with brake fluid. DO NOT REUSE BRAKE FLUID. |