Bendix Commercial Vehicle Systems RD-3 PUSH-PULL VALVES - Manual (Page 2)

2
BENDIX ® PP-1 ®
VALVE
4
3
5
6
8
BUTTON ROLL
PIN
PANEL
MOUNTING
NUT
7
9
FIGURE 2
3. Remove the two machine screws (2) and remove the
lower cover (3).
4. Remove the inlet-exhaust valve (4) and piston (5).
5. Remove o-rings (6 & 7) from piston.
OPERATING AND LEAKAGE TESTS
BENDIX ® PP-1 ® , PP-8 ™ AND RD-3 ™ VALVES
1. An accurate test gauge should be tee’d into the supply
line as a means of controlling the supply pressure
provided. Apply a 120 psi air source to the supply port.
A small volume reservoir (e.g. 90 cu. in.), with a gauge,
should be connected to the delivery port.
2. With 120 psi supply pressure, and the button pulled out
(exhaust position), leakage at the exhaust port should
not exceed a 1” bubble in 5 seconds; at the plunger
stem a 1” bubble in 5 seconds. There should be no
leakage between the upper and lower body.
3. Push the button in (applied position). Leakage at
the exhaust port should not exceed a 1” bubble in
3 seconds; at the plunger a 1” bubble in 3 seconds.
(The RD-3
™ valve will have to be manually held in this
position.)
4. Reduce the supply pressure. At a pressure from 60 to
20 psi, depending on the spring installed, the button
should pop out automatically, exhausting the delivery
volume. (This does not apply to the RD-3
™ , PP-8 ™ or some
PP-1 ® valves).
REMOVAL
Block and/or hold the vehicle by a means other than air
brakes and drain all reservoirs.
1. Drive the button roll-pin out with a punch and remove
the button.
2. Mark each air supply line and its port for easy
reinstallation, then disconnect them. Remove the valve
from the panel by removing the panel mounting nut.
INSTALLATION
1. Install the valve in panel, securing with the panel
mounting nut.
2. Reconnect the air lines using marks made during
removal as a guide.
3. Install the operating button. Secure the operating button
by installing the button roll pin.
DISASSEMBLY: BENDIX ® PP-1 ® , PP-8 ™ AND
RD-3 ™ VALVES
1. Remove the two cap screws (3) which retain the lower
cover and remove the cover. Remove the sealing ring
(4).
2. Insert a small punch through the roll pin hole in the stem
and remove the locknut (5).
3. Remove the inlet-exhaust valve (6) and plunger (7) and
spring (8), if any.
4. Remove o-ring (9) from plunger.
DISASSEMBLY: BENDIX ® PP-5 ™ VALVE
1. Perform same operations as for PP-1 ® valve.
2. Remove the inlet seal (10), shown in Figure 4, from
lower cover. Remove the ring diaphragm (4) from the
inlet seat.
3. Remove piston (11) and o-ring (2).
DISASSEMBLY: BENDIX ® PP-2 ™ VALVE
1. Insert a small punch through the roll pin hole in the
plunger and remove the locknut (1) from the plunger.
2. Withdraw the plunger and remove the spring (9) and
o-ring (8).
Bendix ®
Valve
Automatic
Exhaust
Momentary
Apply
Pilot Trip
Feature
Non-
Automatic
PP-1 ® 20, 30, 40
or 60 psi
- - -
PP-2 ™ 40 psi - - -
PP-5 ™ 40 psi - 18 psi -
RD-3 ™ - Must be held manually - -
PP-8 ™ - - - Will remain in
either position