BENDIX TP-2 TRACTOR PROTECTION VALVE Handbuch - Seite 3

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9. With soap solution:

A. Coat emergency line coupling. Leakage of a 1"

bubble in 5 seconds is permissible (100 SCCM).

B. Coat service line coupling. Make and hold a full hand

or foot valve application. Leakage of a 1" bubble in 5

seconds is permissible (100 SCCM).

10. Connect the coupling and test gauge to the emergency

line hose coupling. Place the tractor protection control

valve to "Normal" position. (If necessary, re-start engine

and build system pressure.) With ignition switch "on"

slowly drain tractor air brake system observing that low

pressure indicator occurs at prescribed pressure (normally

at approximately 60 psi) observe that the emergency

Iine will be vented by the tractor protection valve between

45 to 33 psi (test gauge will drop to 0 psi.)

If the TP-2

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tractor protection valve does not function as

described or if leakage is excessive, it is recommended

that it be replaced with a new or remanufactured unit, or

repaired with genuine Bendix parts, available at Bendix

outlets.

REMOVING AND INSTALLING

REMOVING

1. Block and/or hold vehicle by a means other than air

breaks. Drain air system reservoirs.

2. Identify lines and hoses so that correct lines are

reconnected to proper ports when reinstalling.

3. Remove lines; remove valve.

INSTALLING

1. Mount valve, checking to make certain control cap is

properly positioned. If it is necessary to re-position cap,

refer to No. 3 of "Assembly Instructions."

2. Connect lines making certain proper lines are

connected to correct ports.

DISASSEMBLY

Important: Mark position of control port and tractor

emergency port location in relation to body in such a manner

that mark will not be obliterated during cleaning of parts.

Three (3) springs in valve should be carefully marked as to

their proper location in valve as valve is disassembled.

1. Remove four (4) cap screws (1) Figure 1, lock washers,

and cover (2) from valve.

2. Remove emergency valve (3) and emergency valve

spring (4) from cover.

3. Remove valve seat (5) service and exhaust valve (6),

valve retainer (7), spring (8).

4. Remove o-rings (9), (10), and (11).

5. Remove cap nut (12) and control cap. (13).

6. Remove exhaust valve plunger and diaphragm assembly

from body. (14).

7. Remove exhaust plunger spring (15) from body.

8. Inspect bores in valve body to be sure they are not

damaged or out of round. Clean body, control cap and

cover.

CLEANING AND INSPECTION

1. Clean all metal parts in mineral spirits and dry them

completely.

2. Inspect all parts for excessive wear or deterioration.

Inspect valve seats for nicks or burrs. Check the valve

spring for cracks or corrosion.

3. Inspect the bores of the valve housing for deep scuffing

or gouges.

Replace all parts that were discarded and any parts not

found to be serviceable during inspection, using only genuine

Bendix replacement parts.

ASSEMBLY

Before assembling the TP-2

o-ring grooves, body bores and rubbing surfaces with Bendix

silicone lubricant (Pc. No. 291126) or equivalent.

NOTE: When using pipe thread sealant during assembly

and installation, take particular care to prevent the

sealant from entering the valve itself. Apply the

sealant beginning with the second thread back from

the end.

1. Place in vise with control cap end up. Install o-ring (16)

in groove in the stem of the exhaust valve plunger and

diaphragm assembly (14).

2. Install exhaust plunger spring (15) in valve body and

install exhaust plunger and diaphragm assembly (14).

IMPORTANT: Both sides of diaphragm and clamping

surfaces of body and control cap must be

free of grease. Plunger should be a neat

sliding fit in bore.

3. Position control cap (13) and cap nut (12). Position control

cap to desired port angle (as marked during

disassembly). Install a short (4-6") 1/4" pipe nipple in

control port of cap. Apply pressure firmly on cap, holding

in position with pipe nipple and firmly tighten cap nut to

approximately 50 ft. lbs.

It is important that the cap not be allowed to turn while

tightening the cap nut. Remove pipe nipple from control

port.

4. Place valve in vise with control cap down.

5. Install o-ring (10) in valve body (smaller of two o-rings).

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valve, lubricate all o-rings,