Справочник Пользователя для BENDIX TCH-008-005

1. Dryer is constantly

A.

Excessive system leakage.

A.

Test for excessive leakage and repair.

“cycling” or purging.

Allowable leakage:
   Pre-121 vehicles, single vehicle - 2 psi/minute.
   Tractor trailer - 3 psi/minute.
   121 vehicles, single vehicle - 1 psi/minute per
     service reservoir.
   Tractor trailer - 3 psi/minute per service
     reservoir.

B.

Excessive leakage in fittings, hoses

B.

Using soap solution, test for leakage at fittings,

and tubing connected to compressor,

drain valve (if any) and safety valve in first

air dryer and first reservoir.

reservoir. Repair or replace as necessary.

C.

Defective  check  valve  between  air

C.

Test check valve. Leakage should not exceed

dryer  and  first  reservoir.  (In  standard

1" soap bubble in five seconds. It may be

AD-2, check valve to outlet port.)

necessary to remove check valve to test.
Repair or replace as necessary.

D.

Defective governor.

D.

Test governor for proper cut-in or cut-out
pressures and excessive leakage in both
positions.

E.

Leaking purge valve in air dryer end

E.

Remove end cover. Apply 120 psi at control

cover  (control  side).

port. Soap both sides around purge valve to test
for control piston leakage.
(Permissible leakage - 1" bubble in five
seconds.)

F.

Compressor unloader mechanism

F.

Remove air strainer or fitting from compressor

leaking  excessively.

inlet cavity. With compressor unloaded,  check
for unloader piston leakage.
Slight leakage permissible.

2.  Water in vehicle

A.

Desiccant  requires  replacement.

A.

Replace  desiccant  cartridge.

    reservoirs.

B.

Improper discharge line length or

B.

Minimum of six-foot metal tubing for

improper line material.

two-cylinder compressor; ten-foot for
one-cylinder compressor. Flex hose
can be substituted at ratio of 1-1/2' flex hose for
each 1' of metal.

C.

Air system charged from outside air

C.

If system must have outside air fill provision,

source (outside air not passing

outside air should pass through air dryer.

through air dryer).

(Unused inlet on air dryer can be used.) Use of
this should be minimized.

D.

Air dryer not purging (see Symptom

D.

See cause and remedy for Symptom #5.)

#5).

E.

Purge (air exhaust) time insufficient

E.

Check causes and remedies for Symptom #1.

due to excessive system leakage
(see causes for Symptom #1).

F.

 Air dryer/vehicle application requires

F.

When compressor is loaded (compressing)

additional purge volume.

longer than 90 seconds during normal
operation, additional purge volume may be
needed. (Before proceeding, contact Bendix
representation for consultation.)

G.

Air dryer not compatible with vehicle

G.

Air  dryer  requires  minimum purge time of 30

air system requirement - (Improper air

seconds.  If  compressor  stays  loaded  longer

dryer/vehicle  application).

than 90 seconds and additional purge volume is
added, longer purge time is required. Air dryer
efficiency will decrease as compressor
loaded time increases beyond 120 seconds,
during normal operation of the vehicle. (This
limitation assumes a compressor of
approximately 12 CFM and engine operation at
1600-1900 RPM.) The air dryer will
accommodate occasional longer loaded times,
such as initial system build-up.

3. Safety valve on air dryer

A.

Desiccant cartridge plugged or

A.

Check compressor for excessive oil passing

“popping off” or

saturated.

and/or correct compressor installation. Repair

exhausting air.

or replace as necessary.
Rebuild or replace cartridge.

B.

Defective  check  valve  between  air

B.

Test to determine if air is passing through

dryer outlet port and first reservoir. (in

check valve. Repair or replace.

standard AD-2, check valve in outlet
port.)

C.

Defective fittings, hose or tubing

C.

Check to determine if air is reaching first

between  air  dryer  and  first  reservoir.

reservoir. Inspect for kinked tubing or hose.
Check for undrilled or restricted hose or tubing
fittings.