BENDIX SD-03-3617 Manual do Utilizador descarregar pdf (Página 5)

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-7

™

valve should be inspected every 6 months or

1500 operating hours, whichever comes ﬁ rst, for proper

operation. Should the PP-7

™

valve not meet the elements

of the operational tests noted in this document, further

investigation and service of the valve may be required.

OPERATING AND LEAKAGE CHECKS

To perform the following test, an accurate vehicle test

gauge installed in a spare hose coupling is required. The

vehicle dash gauge(s) should be checked for accuracy

against the test gauge prior to making these tests.

1. Block or hold the vehicle by means other than the

service air brakes.

2. With the PP-7

™

trailer supply valve button out and the

parking control valve in the exhaust, or brakes applied

position, build the air system pressure to governor

cut-out.

3. Apply a soap solution to the exhaust vent and the

plunger stem of the PP-7

™

valve to check for leakage.

Leakage should not exceed a 1 inch bubble in 5

seconds at either point.

4. Depress the control button of the PP-7

™

valve and

apply a soap solution to the exhaust vent and the

exhaust port. Leakage should not exceed a 1" bubble

in 5 seconds at either point.

5. Install the test gauge and coupling on the trailer supply

coupling (tractor emergency hose coupling) at the rear

of the tractor.

6. Place the tractor parking control valve in the “brakes

released” position and observe an immediate rise in

pressure on the test gauge. The pressure registered

on the test gauge should equal dash gauge or system

pressure.

7. Apply a soap solution to the exhaust port of the PP-7

™

valve. Leakage should not exceed a 1" bubble in 5

seconds.

8. With the tractor air system at governor cut-out pressure,

shut off the engine and note the dash gauge pressure.

Quickly disconnect the test gauge and hose coupling

from the tractor-trailer supply line coupling. Leakage

from the tractor-trailer supply line should cease and

the button of the PP-7

™

valve should be out when the

pressure in the supply line drops below 40 P.S.I.

9. Reconnect the test gauge to the tractor-trailer supply

line and depress the button of the PP-7

™

valve. Open

the drain cocks of No. 1 and No. 2 service reservoirs

slightly. Note at what pressure (descending) the

button of the PP-7

™

valve pops out and exhausts the

tractor-trailer supply line. This should occur between

20-45 P.S.I. air system pressure.

If the PP-7

™

trailer supply valve fails to function as

described or if leakage is excessive, it is recommended

that it be returned to the nearest Bendix authorized outlet

for a factory remanufactured valve. If this is not possible,

the valve should be repaired using only genuine Bendix

replacement parts, in which case the following should

prove helpful.

NOTE: Bendix Maintenance Kit piece number 287367 is

available for the PP-7

™

trailer supply valve from

any authorized Bendix outlet. This kit contains

all the necessary parts to completely repair the

valve.

REMOVAL

1. Chock the vehicle wheels and drain all air system

reservoirs completely.

2. Disconnect all air lines leading to and from the PP-7

™

valve and mark them for proper reconnection.

3. Using a drift pin punch, remove the spirol pin (1) Fig. 2

which secures the button to the plunger. Remove the

button (2).

4. Using a 1-5/16 inch wrench, remove the special thin

nut which secures the PP-7

™

valve to the panel and

remove the valve.

DISASSEMBLY

1. Mark the upper and lower body halves to show their

relationship to each other.

2. Remove the two 1/4 inch-20 cap screws, that secure

the lower valve body to the upper valve body, using a

7/16 inch wrench. Separate the two body halves.

3. Remove and discard the square cut sealing ring (3)

between the upper and lower body halves.

4. Remove the end plate (4) and o-ring (5) from the lower

body and discard the o-ring.

5. Remove the control piston (6) and piston return spring

(7).

6. Remove the large (8) and small diameter o-rings (9)

from the piston and discard them.

7. Remove the internal truarc retaining ring (10) from the

lower body.

1 2 3 4 5 6 7

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