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Technical Bulletin

Bulletin No.: PRO-03-18 Effective Date: 2/15/79 Cancels: N/A Page: 1 of 2

Subject: MV-2 CONTROL VALVE PRODUCT DESCRIPTION

The MV-2 Control Valve has been released and is being used at the present time by

White and I.H.C. on certain models. This is a modular-type control valve with two

buttons, which will perform the following functions:

• Tractor protection control

• Trailer service air supply

• System park

• Trailer park only

• Trailer charge with tractor spring brakes applied (tractor park only)

• Supplied reservoir selection

The valve will be serviced by spool replacement cartridges and a dual circuit supply

valve maintenance kit.

The service spool for the trailer control portion (red button) is 101569. This includes a

pre-lubricated spool and a spirol pin for attaching the button.

The spool for tractor control (yellow button) is piece No. 101570; also packaged pre-

lubricated with spirol pin included.

The dual circuit supply valve, included in the tractor control section, is a spring loaded

valve which selects No. 1 reservoir as the supply for both control valves, unless No. 1

reservoir falls at least 25 p.s.i. below No. 2 reservoir, at which point the valve will cycle

and establish No. 2 reservoir as the supply. Dual circuit supply valve may be serviced

with a maintenance kit Piece No. 101557.

Note: Reservoir No. 1 must be the reservoir that supplies the rear tractor

axle(s).

Reservoir No. 2 must be the reservoir that supplies the front axle.

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Technical BulletinBulletin No.: PRO-03-18 Effective Date: 2/15/79 Cancels: N/A Page: 1 of 2Subject: MV-2 CONTROL VALVE PRODUCT DE

Body assemblies will also be available in case of valves damaged by accident or fire, aswell as buttons and pins. The chart below summarizes the MV-2

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