JLG T350 Service Manual - Manual (Page 39)

SECTION 3 - CHASSIS & TURNTABLE
3121198 – JLG Lift – 3-3
reverse is significantly less effective than in the forward
direction.
The hydraulic braking system must be inspected at least
as often as the brakes on the tow vehicle, but no less than
once per year. This inspection includes an assessment of
the condition and proper operation of the wheel cylinders,
brake shoes, brake drums and hubs.
Check the fluid level in the master cylinder reservoir at
least every three months. If you tow your trailer an average
of 1,000 miles per month in a hot and dry environment,
you must check the brake fluid level once a month. The
brake fluid reservoir is located on the tongue of the trailer.
Fill with DOT 3 or 4 brake fluid.
Self Adjusting Mechanism
The self adjusting feature adjusts the brakes on both for-
ward and reverse stops. Brake adjustment occurs only
when lining wear results in enough gap between the
shoes and the drum surface. The added clearance allows
the adjuster mechanism to rotate the screw assembly at
the bottom of the brake. That action expands the distance
between the shoes and thus closes the gap to the drum
surface.
Parking Brake
The parking brake is cable operated. The parking cable
body is mounted to the brake backing plate. The cable
end is attached to the internal parking brake lever to actu-
ate the brake. The internal parking brake lever, which is
mounted to the secondary shoe, transfers applied cable
force through a parking strut which is attached to the pri-
mary shoe. This transferred load generates a spreading
force between the primary and secondary shoes. The
shoes move toward the drum until contact is made. Fric-
tion generated between the drum and lining contact sur-
face results in parking brake capablilty.
General Maintenance
DRUM BRAKE ADJUSTMENT
Brakes should be adjusted (1) after the first 200 miles of
operation when the brake shoes and drums have
“seated,” (2) at 3000 miles intervals, (3) or as used and
performance requires. The brakes should be adjusted in
the following manner:
DO NOT LIFT OR SUPPORT THE TRAILER ON ANY PART OF THE
AXLE OR SUSPENSION SYSTEM. NEVER GO UNDER ANY
TRAILER UNLESS IT IS PROPERLY SUPPORTED ON JACK
STANDS WHICH HAVE BEEN RATED FOR THE LOAD. IMPROP-
ERLY SUPPORTED VEHICLES CAN FALL UNEXPECTEDLY AND
CAUSE SERIOUS INJURY OR DEATH.
1. Jack up trailer and secure on adequate capacity
jack stands. check that the wheel and drum rotate
freely.
2. Remove the adjusting hole cover from the adjusting
slot on the bottom of the brake backing plate.
1. Anchor Post
2. Wheel Cylinder
3. Hold Down Spring
4. Primary Shoe
5. Adjuster Assembly 6. Adjuster Spring
7. Secondary Shoe
8. Backing Plate
9. Retractor Spring
Figure 3-2. Hydraulic Brake Assembly