BENDIX PP-DC Manuale - Pagina 4
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SECONDARY
SERVICE RESERVOIR
SUPPLY
PRIMARY SERVICE
RESERVOIR
FIGURE 5 - PARKING BRAKES APPLIED
9. Components with stripped threads or damaged
parts should be replaced rather than repaired. Do
not attempt repairs requiring machining or welding
unless specifically stated and approved by the
vehicle and component manufacturer.
10. Prior to returning the vehicle to service, make
certain all components and systems are restored
to their proper operating condition.
11. For vehicles with Antilock Traction Control (ATC),
the ATC function must be disabled (ATC indicator
lamp should be ON) prior to performing any vehicle
maintenance where one or more wheels on a drive
axle are lifted off the ground and moving.
PREVENTIVE MAINTENANCE
Important: Review the Bendix Warranty Policy before
performing any intrusive maintenance procedures. A warranty
may be voided if intrusive maintenance is performed during
the warranty period.
No two vehicles operate under identical conditions, as a
result, maintenance intervals may vary. Experience is a
valuable guide in determining the best maintenance interval
for air brake system components. At a minimum, the
™
PP-DC
valve should be inspected every 6 months or 1500
operating hours, whichever comes first, for proper operation.
Should the PP-DC
™
valve not meet the elements of the
operational tests noted in this document, further investigation
and service of the valve may be required.
4
PLUNGER O-RING
BUTTON
PLUNGER
GUIDE SPOOL
EXHAUST
SEAL
EXHAUST
SERVICE CHECKS
1. Remove any accumulated contaminants. Visually
inspect the valve's exterior for excessive wear or physical
damage. Repair/replace as necessary.
2. Inspect all air lines connected to the valve for signs of
wear or physical damage. Repair/replace as necessary.
3. Test air line fittings for excessive leakage. Repair/replace
as necessary.
LEAKAGE AND OPERATIONAL TESTS
To perform the following tests, connect two separate 120
psi air sources to the PP-DC
accurate test gauge into the supply lines, and provide for a
means to control supply line pressure. Connect a small
volume with a gauge to the delivery port.
LEAKAGE TEST
1. Supply the valve with 120 psi from the primary reservoir
supply port. With the button out, coat the exhaust port
and the plunger stem with a soap solution. Leakage
should not exceed a 1" bubble in 5 seconds. There
should be no leakage from the secondary reservoir supply
port.
2. With the button out, supply the valve with 120 psi from
the secondary reservoir supply port. There should be no
leakage from the primary reservoir supply port.
DELIVERY
™
valve supply ports. Tee an