Table of Contents
Advertisement
Braking System - Treadle Valve
Section 250-0070
159 bar
(2 300 lbf/in²)
17. Install stop light pressure switch (55) and lockup
drop out pressure switch (54) in plate (21) and tighten
securely.
Note: The valve assembly must be connected to a
hydraulic supply and pressures set before further
assembly can be done.
TESTING AND ADJUSTMENTS
Numbers in parentheses refer to Fig. 1.
Note: A hydraulic test fixture with capabilities similar to
the one shown in Fig. 9 is required.
1. Position the valve in the test fixture to allow
plungers to be activated by hand using a lever. See
Fig. 10.
2. Attach pilot supply line to 'Px' port of valve body (20).
3. Attach main supply lines to 'P1' and 'P2' ports of
valve body (20).
8
PILOT
SUPPLY
SUPPLY
FRONT
BRAKE
PRESSURE
Fig. 9 - Typical Test Fixture
RETURN
SIMULATED
BRAKE VOLUME
SCREWDRIVER
OR PRY BAR
NORMAL POSITION
FULLY ACTUATED
Fig. 10 - Actuator Plunger Actuation
SM - 499
REAR
BRAKE
PRESSURE
SM - 1238
SM 1225 Rev 1 9-99
Hide quick links:
Advertisement
Table of Contents
