BENDIX PP-DC Руководство - Страница 6

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3. With the button in, coat the exhaust port and the plunger

stem with a soap solution. Leakage at both areas should

not exceed a 1" bubble in 3 seconds.

OPERATIONAL TEST

1. With the button out, supply either supply port with 120

psi of air. Then push the button in. Air pressure should

rise in the delivery volume equivalent to supply pressure.

2. Pull the button out. Delivery pressure should exhaust to

0 psi.

3. Build each supply source to 120 psi. Decrease supply

pressure at the secondary service reservoir supply port

at a rate of 10 psi per second. Primary supply pressure

and delivery pressure should not drop below 100 psi.

Repeat the test for decreasing primary service reservoir

pressure.

4. Build each supply source to 120 psi. Then decrease

both supply pressures to below 20 to 30 psi. The button

should automatically "pop" out when pressure drops

within that range.

If the PP-DC

™

valve fails to function as described, or if

leakage is excessive, repair the valve or replace it at the

nearest authorized Bendix Commercial Vehicle Systems

parts outlet.

REMOVAL

1. Identify and mark or label all air lines and their

connections on the valve.

™

2. Remove the PP-DC

valve from the vehicle and save the

mounting hardware.

INSTALLATION

1. Install the PP-DC

™

valve in its location on the dashboard.

Using the mounting hardware saved in "REMOVAL,"

secure the valve to the vehicle.

2. Reconnect all air lines to the valve using the identification

made in "REMOVAL."

3. Perform "OPERATIONAL AND LEAKAGE TESTS" before

placing the vehicle back in service.

DISASSEMBLY

The following disassembly and assembly procedures are

for reference only. Always have the appropriate maintenance

kit on hand and use its instructions in lieu of those presented

here. Refer to Figure 6 throughout the procedure.

1. Turn the button counterclockwise to remove it from the

plunger stem.

2. Remove the four screws that secure the cover to the

body, and remove the cover.

3. Pull the plunger stem to remove the plunger and the

guide spool from the body.

4. Remove plunger spring(6) and discard.

5. If necessary, use a screwdriver to carefully remove the

check valve seat from the body. Be sure not to damage

the check valve seat or the body.

6. Remove and discard check valve seat o-rings(7) and (8).

7. Turn the body upside down and gently tap it on a flat

surface to remove check valve(9). Discard the check

valve.

8. Remove the guide spool from the plunger. Remove and

discard o-ring(1) from the guide spool.

9. Remove and discard o-rings(2), (3) and (5) from the

plunger. Also remove and discard exhaust seal(4).

CLEANING & INSPECTION

1. Wash all metal parts in mineral spirits and thoroughly

dry.

2. Inspect all re-usable parts for excessive wear or damage.

Inspect the body for gouges or deep scuffing. Replace

key numbers 1-9 (and any parts not determined usable)

with genuine Bendix replacements.

ASSEMBLY

Before assembly, lubricate all o-rings, o-ring grooves, rubbing

surfaces and bores with Bendix silicone lubricant (Pc. No.

291126) or equivalent.

1. Place check valve(9) into its seat in the body with its flat

surface facing upward. If necessary, reach into the body

to make sure the valve is seated evenly in the bore.

2. Install o-rings(7) and (8) on the check valve seat and

install the check valve seat into the body. Make sure the

seat is fully seated-its surface should be even with the

body's surface.

3. Install plunger spring(6) into the body. Make sure it stands

upright and is seated properly in the body bore. (It should

surround the protrusion or "lip" at the bottom of the body

bore.)

4. Install o-rings(2), (3), (5) and exhaust seal(4) onto the

plunger. Then install the plunger into the body. Line up

the plunger's index tabs with the spaces in the body

bore for ease of installation.

5. Install o-ring(1) onto the guide spool. Then install the

guide spool over the plunger and into the body. Press

the guide spool into place firmly.

6. Place the cover onto the body and secure with its four

screws. Torque to 35 in. lbs.

7. Thread the button clockwise onto the plunger stem. It

should take approximately 3 full button revolutions to

install it on the plunger. The protrusions on the side of

the plunger should line up with the button grooves. Push

on the button a number of times to make sure the plunger

moves freely throughout its range of motion.

NOTE: BEFORE PLACING THE VEHICLE BACK INTO

SERVICE, PERFORM THE "LEAKAGE AND

OPERATIONAL TESTS" IN THIS MANUAL.