BENDIX VM-3 FIREWALL MANIFOLD Instructions Download

Page: 4 / 4

DISASSEMBLY

Block the wheels and drain the air brake system. Remove
air lines and remove manifold from vehicle.

Remove the large cap nut at port No. 1 and remove the
double check shuttle.

Remove the four machine screws from the PR-4

™

valve cover.

(Caution - the cover is spring loaded.) Remove the PR-4

™

valve piston assembly.

Do not attempt to remove the retaining

ring and stem from the piston.

ASSEMBLY

Before assembly, lubricate all o-rings, bores and mating
surfaces with BW-650M lubricant pc. no. 291126 (Dow
Corning 55M). Replace any worn or deteriorated o-rings and
shuttle, item 2 in Fig. 5, if necessary.

Install shuttle in guide in body and install cap nut

After cleaning and lubricating, assemble the PR-4

™

valve

section, replacing o-ring item 3 and inlet exhaust valve item
4 in Fig. 6 as required.

Replace valve on vehicle and check per operating and
leakage tests.

Summary of Contents for VM-3 FIREWALL MANIFOLD

Page 1: ...utions should be observed at all times 1 Park the vehicle on a level surface apply the parking brakes and always block the wheels Always wear safety glasses 2 Stop the engine and remove 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 op...

Page 2: ...2 in cab Suggested use supplies secondary reservoir air to the balance port of the SR 1 spring brake control valve Port Ident on No Casting Function 1 Frt Gauge Connects to gauge for No 2 circuit Blue reservoir 2 Prk Sup Supplies air from double check valve Red to park control valve 3 Rear Gauge Connects to gauge for No 1 circuit Green reservoir 4 Hand Brake Supplies air from No 2 circuit reservoi...

Page 3: ...estigation and service of the valve may be required SERVICE CHECKS OPERATINGAND LEAKAGE CHECKS 1 Start engine and charge both sides of dual system 2 Stopengine drainthefrontbrakereservoiranddisconnect tube fitting at port No 1 in Fig 1 identified as Frt Sup Blue Excessive leakage would indicate a faulty double check valve 3 Restore and recharge both systems Drain the rear brake reservoir and disco...

Page 4: ...ove the PR 4 valve piston assembly Do not attempt to remove the retaining ring and stem from the piston ASSEMBLY Before assembly lubricate all o rings bores and mating surfaces with BW 650M lubricant pc no 291126 Dow Corning 55M Replace any worn or deteriorated o rings and shuttle item 2 in Fig 5 if necessary Install shuttle in guide in body and install cap nut After cleaning and lubricating assem...

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BENDIX VM-3 FIREWALL MANIFOLD, Instructions

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