WABCO 973 002 Test Instruction

Trailer control valves

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Explanation of Symbols
Potential hazard situation which can
WARNING
cause serious personal injury or death
if the safety instruction is not observed.
Potential hazard situations that can
CAUTION
cause minor or moderate personal inju-
ry if the safety instruction is not ob-
served.
Potential hazard situations that can
CAUTION
cause material loss if the safety in-
struction is not observed.
!
Important instructions, information or tips that you
should always observe.
List
Step
!
Carefully read through all the safety information be-
fore starting the testing.
General safety instructions
Only qualified skilled personnel with
WARNING
specific system knowledge are author-
ized to perform the device testing at the
test bench.
Comply with the company and national accident pre-
vention/health & safety regulations.
Danger of bodily injury
CAUTION
Undo the screw plugs, hoses and
equipment parts only when the respec-
tive lines have been vented.
© 2006 American Standard All rights reserved 973 002 981 3/05.2006
Test instruction for
Trailer Control Valves
973 002
Fig. 1 Trailer Control Valve 973 002 ... 0 / functional symbol
Test instruction for device 973 002 ... 0
500
501
503
Equipment/tools required
Test bench 435 197 000 0 or adequate testing
equipment (see fig. 3 and 4)
Rake angle (with fixing nuts M8
(2x) for devices), see the adja-
cent diagram
Two tees
Soapsuds and brush
Nozzle:
1.3 mm
Additional documents required
!
The documents are available on the WABCO web-
site http://www.wabco-auto.com - simply enter
the product or document number in INFORM.
Test Bench 435 197 000 0 - Operating Instructions
General Repair and Test Information
(E)
505
508
1/9

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Summary of Contents for WABCO 973 002

  • Page 1 Potential hazard situations that can CAUTION cause minor or moderate personal inju- Fig. 1 Trailer Control Valve 973 002 ... 0 / functional symbol ry if the safety instruction is not ob- served. Test instruction for device 973 002 ... 0...
  • Page 2: Shut-Off Cock

    1). The output side of pressure regulator D must be unpressurised. Shut-off cocks A B C F L V 7 11 12 21 22 open closed Table 1: Normal position of stopcocks on the test bench © 2006 American Standard All rights reserved 973 002 981 3/05.2006...
  • Page 3: Fine Control Valve

    Check tightness at exhaust 8 cm /min of the shut-off cock 42 and Never install WARNING at the exhaust of the a leaking device. trailer con- trol valve on the vehicle. © 2006 American Standard All rights reserved 973 002 981 3/05.2006...
  • Page 4: Fine Control Valve

    Perform this step only for variant 505: Perform this step only 8...0 for variant 505: 0...8 Fine control valve 41: Increase and lower the pressure rapidly three times. © 2006 American Standard All rights reserved 973 002 981 3/05.2006...
  • Page 5: Manometers

    Fine control valve 41: 0...0,1 Residual pressure Carry on decreasing the pressure slowly. Shut-off cock 42: Open the pass. © 2006 American Standard All rights reserved 973 002 981 3/05.2006...
  • Page 6: Manometers

    Precision control valves 11, 41, 42 and 43: Reduce the pressure. Table 2: Test steps "Main Valve" © 2006 American Standard All rights reserved 973 002 981 3/05.2006...
  • Page 7 M41+0.2±0.1 M41+0.2±0.1 7.5...8 M41+0.7 -0.4 ≥7.7 ≥7.2 ≥7.7 ≥7.7 M41-0.2 M41+0.2 +0.2 -0.8 ≥7.7 ≥7.7 M41+1 7.2...7.8 7.2...7.8 M41+0.2 -1.2 ≥7.7 ≥7.2 M41-0.2 M41+0.2 Table 3: Test and default values: © 2006 American Standard All rights reserved 973 002 981 3/05.2006...
  • Page 8 Wait for this value at M 12/21, value in then test M 41 (test bench: the line M 2). before. 4,5...5,3 Precision control valve 11, 22, 41 and 43: Reduce the pres- sure. © 2006 American Standard All rights reserved 973 002 981 3/05.2006...
  • Page 9: Shut-Off Cock

    Shut-off cocks 12, 21 and 22: Clean device and unclamp. Shut the pass. Shut-off cocks 11, 41, 42 and 43: Open the vent. Table 4: Test steps "Side Valve" © 2006 American Standard All rights reserved 973 002 981 3/05.2006...

Table of Contents