Terex TR60 Maintenance Manual page 442

Braking System - Treadle Valve
Section 250-0070
Fig. 11 - Deadband Adjustment
6. Tighten nut (34) and remove the shim stock. Apply
a few drops of Loctite 243 to nut (34).
Pedal Angle Adjustment
1. Loosen nuts (48) at the rear of actuator cam (36).
Do not loosen nuts (30) on 'U' bolts (32).
2. Adjust pedal (50) angle by turning screws (33)
located in the top face or ribbed side of pedal (50).
Clockwise will raise the angle and anticlockwise will
lower the angle.
3. Adjust the two screws (33) evenly. When the
desired pedal angle is achieved, apply Loctite 243 on
screws (33).
4. While holding the pedal down, retighten the rear
capscrews (51) and nuts (48).
INSTALLATION
Numbers in parentheses refer to Fig. 1.
Note: Tighten all fasteners to standard torques listed
in Section 300-0080, STANDARD BOLT AND NUT
TORQUE SPECIFICATIONS.
Note: Tighten all hydraulic lines fitted with ORFS
connections, as described in Section 250-0000,
BRAKING SYSTEM SCHEMATIC. Renew all 'O' rings
where used.
1. Position treadle valve assembly on cab floor and
secure with mounting hardware. Remove blanking
caps from ports.
10
SM - 1239
Shim Stock
0.64 mm
(0.025 in)
Actuator Base
Return Stop
2. Remove blanking caps and connect hydraulic lines
to the treadle valve assembly as noted at removal.
3. Connect electrical connections to stop light pressure
switch (55) and lockup drop out pressure switch (54)
as noted at removal.
4. Check oil level in steering and brake control tank
and add oil if required. Refer to Section 220-0040,
STEERING AND BRAKE CONTROL TANK for correct
fill level, and use only oil as specified in Section
300-0020, LUBRICATION SYSTEM.
5. Remove wheel blocks, start the engine and bring
hydraulic oil to operating temperature.
6. Apply the brakes and check for oil leaks. Tighten
line connections and fittings as necessary.
Note: When performing Step 7, make sure that
parking brake applies and releases appropriately.
7. Check brake operations by actuating pedal and
park/emergency control.
8. Switch off engine and check oil level in steering and
brake control tank. See Step 4.
SERVICE
Numbers in parentheses refer to Fig. 1.
Brake Actuating Pressure
Note: Test front 'B1' and rear 'B2' brake circuit actuating
pressures at diagnostic test points and adjust if necessary.
Refer to Section 250-0000, BRAKING SYSTEM
SCHEMATIC for location of test points.
1. Connect a hydraulic gauge capable of recording a
pressure of 0 - 207 bar (0 - 3 000 lbf/in²) to diagnostic
pressure point for front 'B1' brake pressure.
2. Start engine and bring hydraulic oil temperature to
operating temperature.
3. Actuate treadle valve fully and check reading on
pressure gauge. Pressure reading should be 159 bar
(2 300 lbf/in²).
4. Repeat steps 1 through 3 at diagnostic pressure
point for rear 'B2' brake pressure. Pressure reading
should be 52 bar (750 lbf/in²).
Note: If the pressures to the brake circuits have been
determined as low or high, the pressures can be
raised or lowered by an in service (in situ) adjustment.
SM 1225 Rev 1 9-99