Hino 600, Workshop Manual, Page: 334 / 451

SERVICE BRAKE (FULL AIR BRAKE) BR02–56
(5) Make sure the new single (piggyback) spring brake is fully released as
outlined in Section 2 on page BR02-50 of this manual. Position the
diaphragm in the bottom recess of the chamber and, with very close
attention taken to assure all mating parts are aligned straight and the
air lines are positioned to mate with the vehicle air supply lines,
replace the service clamp ring.
(6) Re-install the clamp bolts and nuts. Alternately tighten each nut in
5-10 Lbs.Ft. torque increments while constantly rechecking mating
parts alignment. (If re-alignment is required, loosen clamp nuts and
repeat Step (5) above). Firmly tap around circumference of the clamp
ring with a hammer to assure the full seating of the clamp and
tighten
the nuts to 30-35 Lbs-Ft. torque .
(7) Apply a non-hardening sealing compound to the hose fittings and re-
install both of the air lines to the chamber, being sure each is mated to
the correct air inlet port according to the markings made earlier.
MGM
Brakes recommends the fittings be tightened to 25-30 Lbs.-Ft.
torque into the chamber air inlet ports.
(8) Using the vehicle system air, charge the spring brake with full line
pressure (minimum 100 psi). Spray only soapy water or leak detection
solution (NEVER ANY TYPE OF OIL!) to the air line fittings and
inspect for air leaks.
If bubbles appear, tighten fittings slightly, but
not over 30 Lbs.-Ft. torque.
(9) With the spring brake still fully charged with full line pressure, apply
and hold foot brake treadle valve down to charge the service brake
chamber.
IMPORTANT
At this time, remove the vise-grip pliers from the service push-
rod so that the piston can return to a normal position in the
chamber. Now test for air leaks around the circumference of the
service clamp ring by spraying with soapy water or leak detec-
tion solution. If bubbles appear, firmly tap the circumference of
the clamp ring with a hammer and retighten the clamp nuts until
leaks cease. MGM Brakes recommends 30-35 Lbs.-Ft. torque on
the clamp hex nuts.
(10) On all MGM Brakes models fitted with an EXTERNAL BREATHER
TUBE, wipe the open end of the connector tube clean to be sure that
no oil is present, apply a high quality rubber cement to the tube and
re-insert tube into flexible elbow a minimum 1/2 inch engagement.
If the old single unit was not equipped with an EXTERNAL
BREATHER TUBE, drill a 1/2 inch diameter hole 1 inch from the top of
the non-pressure chamber, at a point closest to the center line
between the air ports, but in the upper half of the chamber facing
away from the road surface. Remove any burrs around the hole, install
a new rubber elbow in the non-pressure chamber, wipe the open end
of connector tube clean to be sure no oil is present. Apply a high qual-
ity rubber cement to the tube and insert the tube into the flexible
elbow with a minimum 1/2 inch engagement.
IMPORTANT
These units must be mounted with the BREATHER TUBE in the
upper half of the non-pressure chamber facing away from the
road surface and the tube glued or clamped securely into the
rubber elbows. Failure to comply with these installation instruc-
tions will void the MGM Brakes Warranty without remedy.
(11) With air pressure exhausted from the service chamber, but with line
pressure still on the spring brake, remove the release nut, washer and
bolt for all "TR" models. Replace these parts in their storage pocket on
the chamber (or in the vehicle tool box if a storage pocket is not on the
chamber) and
tighten the nut against the flat washer to 10 Lbs.-Ft.
torque .
SHTS068020200047
Apply
Adhesive
Here
1/2-inch
Minimum
Engagement
SHTS068020200048