JLG T350 Service Manual - Manual (Page 47)

SECTION 3 - CHASSIS & TURNTABLE
3121198 – JLG Lift – 3-11
Bleeding the Brake System
DO NOT USE BRAKE FLUID DRAINED FROM THE BRAKE SYSTEM
IN REFILLING THE MASTER CYLINDER. USED BRAKE FLUID CAN
BE CONTAMINATED FROM THE SYSTEM.
1. Remove the master cylinder filler cap and fill reser-
voir with DOT type 3 or 4 automotive brake fluid.
2. Check all hydraulic line fittings and connections to
make sure they are leak free.
3. At brake assembly, connect a bleeder hose to
bleeder fitting on the wheel cylinder and submerge
the free end in a container with brake fluid. DO NOT
reuse brake fluid.
NOTE: Use a power bleeder or a bar with a 2" (50 mm) hitch
ball attached. Do not use the breakaway cable for
bleeding the brake system. If a power bleeder is
used, air pressure of 35 psi (2.4 Bar) is most effec-
tive.
4. Loosen the bleeder fitting at the top of the brake
assembly.
5. Apply the actuator and tighten the bleeder fitting.
Return the actuator to the forward position. Again,
loosen the bleeder valve one turn and apply the
actuator. Repeat this procedure until fluid expelled
from the bleeder hose is free of air bubbles. It is
helpful to lower the trailer tongue to promote air
bubble movement in the brake tubing. It is also help-
ful to tap gently along the brake tubing during the
brake bleeding to keep air bubbles from sticking to
the inside of the brake tubing. During this proce-
dure, the master cylinder reservoir fluid level must
be maintained at no less than 1/2 full and no more
than 1/2" (13 mm) from the top of the reservoir.
6. When no air bubbles are visible, close the bleeder
valve securely and remove the bleeder hose.
7. Repeat steps 1 thru 6 for the remaining brake.
8. After bleeding has been completed, re-check fluid
level in the master cylinder.
Towing
THE TRAILER MAY DISCONNECT IF NOT PROPERLY SECURED.
THE RELEASE HANDLE MUST BE FULLY CLOSED BEFORE TOW-
ING. DO NOT FORCE THE RELEASE HANDLE INTO THE CLOSED
POSITION.
1. Position the actuator ball socket above the ball.
DO NOT DAMAGE THE ACTUATOR WHEN BACKING UP TOWING
VEHICLE FOR HOOK-UP.
2. Hold the release handle in the open position.
Release handle must be held in fully open position
to remove from or place on ball.
3. Lower trailer tongue until ball rests in ball socket.