BENDIX PR-3 Manual de usuario

Bendix®PR-3™and PR-4™Valve Maintenance Kit

Kit Contents

Item No. Description Qty.

1 Piston Assembly with O-ring 1

2 O-ring 1

3 Spring 1

4 Check Valve 1

5 Tube of Lubricant 1

6 Retaining Ring 1

Bendix®PR-3™Reservoir Control Valve Bendix®PR-4™Pressure Protection Valve

Figure 1 Figure 2

This kit will service both the Bendix®PR-3™Reservoir

Control Valve and the Bendix®PR-4™Pressure Protection

Valve. The principle di󰀨erence between the two (2) valves

is the inclusion of the check valve components in the PR-3

reservoir control valve. See Figures 1 and 2. When this kit

is used for the repair of a PR-4 pressure protection valve,

pressure protection valve (Figure 2) items 2, 3, and 4 will

not be used.

This kit consists of the items which are keyed to the sectional

views of both valves, by the circled key numbers.

Spring(s)

Spring Retainer

Machine

Screws

Machine

Screws

Body

O-ring

Retainer

GENERAL SAFETY GUIDELINES

WARNING! PLEASE READ AND FOLLOW THESE INSTRUCTIONS

TO AVOID PERSONAL INJURY OR DEATH:

When working on or around a vehicle, the following guidelines should be observed AT ALL TIMES:

▲Park the vehicle on a level surface, apply the

parking brakes, and always block the wheels.

Always wear personal protection equipment.

▲Stop the engine and remove the ignition key

when 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.

▲Do not attempt to install, remove, disassemble,

or assemble a component until you have read,

and thoroughly understand, the recommended

procedures. Use only the proper tools and

observe all precautions pertaining to use of those

tools.

▲If the work is being performed on the vehicle’s

air brake system, or any auxiliary pressurized air

systems, make certain to drain the air pressure

from all reservoirs before beginning ANY work

on the vehicle. If the vehicle is equipped with

a Bendix®AD-IS®air dryer system, a Bendix®

DRM™dryer reservoir module, a Bendix® AD-9si®,

AD-HF®, or AD-HFi™air dryer, be sure to drain the

purge reservoir.

▲Following the vehicle manufacturer’s

recommended procedures, deactivate the

electrical system in a manner that safely removes

all electrical power from the vehicle.

▲Never exceed manufacturer’s recommended

pressures.

▲Never connect or disconnect a hose or line

containing pressure; it may whip and/or cause

hazardous airborne dust and dirt particles. Wear

eye protection. Slowly open connections with

care, and verify that no pressure is present. Never

remove a component or plug unless you are

certain all system pressure has been depleted.

▲Use only genuine Bendix®brand replacement

parts, components, and kits. Replacement

hardware, tubing, hose, fittings, wiring, etc.

must be of equivalent size, type, and strength as

original equipment and be designed speciﬁ cally

for such applications and systems.

▲Components with stripped threads or damaged

parts should be replaced rather than repaired.

Do not attempt repairs requiring machining or

welding unless speciﬁ cally stated and approved

by the vehicle and component manufacturer.

▲Prior to returning the vehicle to service, make

certain all components and systems are restored

to their proper operating condition.

▲For vehicles with Automatic 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.

▲The power MUST be temporarily disconnected

from the radar sensor whenever any tests USING

A DYNAMOMETER are conducted on a vehicle

equipped with a Bendix® Wingman®system.

▲You should consult the vehicle manufacturer's operating and service manuals, and any related literature,

in conjunction with the Guidelines above.

REMOVAL

Before removing the valve, park the vehicle and drain the air

system completely, follow the safety guidelines on page 2.

1. To aid in the installation of the valve, mark the air lines

and their respective ports before disconnecting.

2. Remove and retain the mounting hardware.

3. Remove the valve from the vehicle.

DISASSEMBLY

1. Remove the four (4) round head machine screws while

holding the spring retainer to the body. Remove the

spring retainer.

The spring retainer is under a spring load and must

be removed carefully.

2. Remove and retain the spring(s) under the retainer for

reuse.

NOTE: Some Bendix®PR-3™Reservoir Control Valves

and Bendix®PR-4™Pressure Protection Valves have

only one (1) spring and some will have two (2).

3. Remove and discard the piston assembly.

NOTE: This would conclude the disassembly procedure

for a PR-4 pressure protection valve (Figure 2). The

following steps are for the PR-3 reservoir control valve

(Figure 1).

4. Discard the retaining ring.

5. Remove and reuse the o-ring retainer.

6. Remove and discard the o-ring, spring, and check valve.

ASSEMBLY

NOTE: Prior to the assembly of new parts into the valve,

clean the internal passages with a suitable solvent and dry

thoroughly. Grease all o-rings, o-ring grooves, bores, and

pistons using the lubricant supplied with this kit.

1. Install the piston assembly in the valve body.

2. Position the spring(s) on the piston and install the spring

retainer.

3. Secure the spring retainer using the four (4) round head

machine screws. Torque the screws to 20-30 in-lbs

(2.3-3.4 N•m).

This completes the reassembly of the PR-4

pressure protection valve. Proceed to step 4 for the

PR-3 reservoir control valve.

4. Install the spring on the check valve and install in the

valve body.

5. Install the o-ring in the valve body.

6. Install the o-ring retainer taking care that the spring

ts in the protrusion provided on the o-ring retainer

(See Figure 1).

7. Install the retaining ring.

INSTALLATION

1. Clean the air lines connecting to valve.

2. Inspect all lines and/or hoses for damage and replace

as necessary.

3. Install the valve and tighten the mounting bolts.

4. Connect the air lines to the valve.

OPERATING AND LEAKAGE CHECKS

OPERATING CHECKS

1. Provide a pressure gauge and drain the valve at the

supply side and delivery side of the pressure protection

valve being checked.

2. Build up the air system to full pressure and shut o󰀨 the

engine.

3. While watching the gauges on the supply and delivery

sides of the valve, slowly begin to exhaust pressure

from the delivery side. Note that both gauges will show

pressure loss until the closing pressure of the pressure

protection valve is reached.

The pressure protection valve should close within ±5 psi

of the pressure indicated on the valve's label or in the

vehicle handbook. The gauge on the delivery side of the

valve should continue to show loss of pressure while

the gauge on the supply side should stop at the same

pressure as the setting of the valve.

4. (PR-3 reservoir control valve only) Build pressure up

and slowly exhaust air from the supply side of the PR-3

reservoir control valve. The gauge on the delivery side

of the valve should remain at the highest pressure

previously attained.

LEAKAGE CHECKS

1. Build up the air system to full pressure and shut o󰀨 the

engine.

2. Apply a soap solution around the cap of the pressure

protection valve. A one (1) in. (2.54 cm) bubble in three

(3) seconds or longer is acceptable. No leakage is

permissible at the bottom of the PR-3 reservoir control

valve.

3. Drain the air pressure from the delivery side of the

pressure protection valve and disconnect the air line

to it.

4. Apply a soap solution to the delivery port. A one (1)

in. (2.54 cm) bubble in ve (5) seconds or longer is

acceptable.



24/7/365 ACCESS

FULL SERVICE AT YOUR FINGERTIPS



BLOGS, PODCASTS, AND MORE

INDUSTRY INSIGHTS FROM INDUSTRY EXPERTS

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WEB-BASED TRAINING

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