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DISASSEMBLY
PP-3
™
PUSH-PULL VALVE
1. Button pin (1) Figure 3, button (2) and mounting nut (3)
are normally removed when valve is removed from
vehicle.
2. Remove two lower body cap screws (4) and lock washers,
then lower body (5) with cover (6).
3. Remove cover with tripper piston (7) from lower body.
4. Remove tripper piston and spring (8) from cover.
5. Remove tripper piston and cover seal o-rings (9 & 10).
6. Insert rod or punch in upper plunger pin hole and hold
plunger (11) from turning while inlet and exhaust valve
nut is removed.
7. Remove washer (13) and valve (14).
8. Pull plunger from upper body.
9. Remove plunger spring (15) and o-ring (16).
10. Remove upper body seal ring (17). Do not remove plugs
from ports marked "Del" in upper body.
CLEANING AND INSPECTION OF PARTS
Wash all metal parts in mineral spirits and then dry.
In particular, make sure supply port in PP-3
body, tripper by-pass slot, and tripper exhaust port in cover
are thoroughly cleaned and unrestricted.
Inspect all parts for excessive wear or deterioration.
BUTTON (2)
SPRING (15)
SUPPLY
PORT
INLET AND
EXHAUST
VALVE (14)
WASHER (13)
DELIVERY
PORT
TRIPPER
PISTON (7)
COVER (6)
TRIPPER
EXHAUST
FIGURE 3 - PP-3
™
CONTROL VALVE
Inspect seats in upper and lower body for nicks and burrs.
Redress seats if damaged.
Inspect plunger and tripper piston bores in bodies and cover
for deep scratches or nicks. They should be smooth and
clean.
Check springs for distortion, corrosion, and cracks.
Replace all parts not considered serviceable during these
inspections, especially o-rings and valves.
ASSEMBLY
Prior to assembly, lubricate o-rings and bearing surfaces
with silicone lubricant Bendix Pc. No. 291126.
1. Install plunger o-ring (16).
2. Position plunger spring (15) in upper body, then press
3. Place inlet and exhaust valve (14), then washer (13),
4. Install and tighten self-locking nut (12). Torque on the
5. Place upper and lower body seal o-ring (17) in place.
6. Install tripper piston o-ring (9).
™
valve upper
7. Position cover o-ring seal (10) on cover.
8. Position tripper spring (8) in cover (6) then press tripper
9. Place cover with tripper installed into lower body.
10. Fasten lower body and cover assembly to upper
SPIROL PIN (1)
TESTING REBUILT PP-3
PLUNGER (11)
NUT (3)
Perform operating and leakage checks as outlined in previous
section.
O-RING (16)
WARNING! PLEASE READ AND FOLLOW
PIPE PLUG
THESE
SEAL (17)
PERSONAL INJURY OR DEATH:
INLET AND
EXHAUST
When working on or around a vehicle, the following
VALVE NUT
general precautions should be observed at all times.
(12)
1. Park the vehicle on a level surface, apply the
EXHAUST
PORT
LOWER BODY
2. Stop the engine and remove ignition key when
(5)
O-RING (9)
O-RING (10)
TRIPPER
SPRING (8)
CAP SCREW
(4)
plunger (11) down inside spring in the body.
over threaded, protruding end of plunger.
nut should be 30 to 40 inch pounds.
piston (7) down over spring and into the cover bore.
assembly with cap screws (4) and lockwashers. Tighten
cap screws evenly and securely.
™
VALVE
INSTRUCTIONS
parking brakes, and always block the wheels.
Always wear safety glasses.
working under or around the vehicle. When
working in the engine compartment, the engine
should be shut off and the ignition key should be
removed. Where circumstances require that the
engine be in operation, EXTREME CAUTION should
be used to prevent personal injury resulting from
contact with moving, rotating, leaking, heated or
electrically charged components.
TO
AVOID
3
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