13 - Fan Clutches Table of Contents 13-1 Part Number Index 13-3 General Information Foreword 13-4 Core Return Guidelines 13-5 Bendix® Fan Clutches 13-6 Remanufactured Horton Application Guide 13-9 Horton Components 13-15 Horton Repair Kit Reference 13-17 Bendix® Fan Clutches Caterpillar 1693/3306 Series (Model FD-3) 13-18 Caterpillar 3406 Series (Model FD-1/FD-3) 13-19 Cummins NTC Series (Model FD-1/FD-3) Core Group 171FD1 13-20 Core Group 183FD3 13-21 Core Group 187FD3 13-22 Core Group 188FD3 13-23 Core Group 189FD3 13-24 Cummins NH Series (Model FD-3) 13-25 Cummins L-10 Series (Model FD-3/FD-L) 13-26 Cummins NT-14 Series (Model FD-3) 13-27 Cummins Super 250 Series (Model FD-3) 13-28 Cummins Core Group 199FD3 (Model FD-L) 13-29 Detroit Diesel 8V71, N & T (Model FD-1) 13-30 Detroit Diesel 8V71N/8V71T, TA - Ford (Model FD-3) 13-31 Detroit Diesel 8V71T Series (Model FD-3) 13-32 Detroit Diesel 8V71/8V92 Series (Model FD-3) 13-33 Horton Fan Clutches Caterpillar 3176 (Model S & HT/S) Core Groups FC1025, FC1026 13-34 Core Groups FC1029, FC1044 13-35 Caterpillar 3306 (Model HT/S) 13-36 Caterpillar 3406 (Model S & HT/S) Core Groups FC1005, FC1007 13-37 Core Groups FC1013, FC1014 13-38 Core Groups FC1016, FC1034 13-39 Core Groups FC1018, FC1019, FC1028 13-40 Core Groups FC1031, FC1047 13-41 Table of Contents 13-FAN CLUTCHES 13 - 1
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13 − Fan ClutchesTable of Contents 13−1Part Number Index 13−3General Information Foreword 13−4 Core Return Guidelines 13−5 Bendix® Fan Clutches 13−6 Remanufactured Horton Application Guide 13−9 Horton Components 13−15 Horton Repair Kit Reference 13−17Bendix® Fan Clutches Caterpillar 1693/3306 Series (Model FD−3) 13−18 Caterpillar 3406 Series (Model FD−1/FD−3) 13−19 Cummins NTC Series (Model FD−1/FD−3) Core Group 171FD1 13−20 Core Group 183FD3 13−21 Core Group 187FD3 13−22 Core Group 188FD3 13−23 Core Group 189FD3 13−24 Cummins NH Series (Model FD−3) 13−25 Cummins L−10 Series (Model FD−3/FD−L) 13−26 Cummins NT−14 Series (Model FD−3) 13−27 Cummins Super 250 Series (Model FD−3) 13−28 Cummins Core Group 199FD3 (Model FD−L) 13−29 Detroit Diesel 8V71, N & T (Model FD−1) 13−30 Detroit Diesel 8V71N/8V71T, TA − Ford (Model FD−3) 13−31 Detroit Diesel 8V71T Series (Model FD−3) 13−32 Detroit Diesel 8V71/8V92 Series (Model FD−3) 13−33Horton Fan Clutches Caterpillar 3176 (Model S & HT/S) Core Groups FC1025, FC1026 13−34 Core Groups FC1029, FC1044 13−35 Caterpillar 3306 (Model HT/S) 13−36 Caterpillar 3406 (Model S & HT/S) Core Groups FC1005, FC1007 13−37 Core Groups FC1013, FC1014 13−38 Core Groups FC1016, FC1034 13−39 Core Groups FC1018, FC1019, FC1028 13−40 Core Groups FC1031, FC1047 13−41
Table of Contents 13−FAN CLUTCHES
13 − 1
Cummins "C" Series (Model S) 13−42 Cummins L−10 Series (Model S & HT/S) Core Groups FC1010, FC1027 13−43 Core Groups FC1012, FC1032 13−44 Core Groups FC1035, FC1036 13−45 Core Group FC1039 13−46 Core Groups FC1042, FC1045 13−47 Cummins Ford NTC Series (Model S) 13−48 Cummins NTC, NT88, 444 Series (Model S & HT/S) Core Groups FC1000, FC1002 13−49 Core Groups FC1011, FC1030 13−50 Cummins N14 Series (Model S & HT/S) Core Group FC1001 13−51 Core Groups FC1015, FC1017 13−52 Core Groups FC1020, FC1021, FC1033 13−53 Detroit 6V92, 8V92, 8V71, 6V71, & 12V71 Series (Model S) 13−54 Detroit 60 Series (Model S & HT/S) Core Group FC1009 13−55 Core Groups FC1022, FC1046 13−56 Core Group FC1037 13−57 Core Groups FC1040, FC1041 13−58 Caterpillar, Cummins, & Detroit in MCI Applications (Model HT/S) 13−59Horton Fan Clutch Components Engine Cooling Fans 13−60 Spacers & Adapters 13−61 Thermal Switches 13−62 Pneumatic Fan Clutch Controls 13−63Horton Repair Kits Super Kits 13−64 Major Overhaul Kits 13−65 Seal Kit 13−66Kysor Style Replacement Components Temperature Controls/Shutterstats 13−67 Midland Replacement Repair Kit 13−68Maintenance Troubleshooting 13−69 Troubleshooting 13−70 Troubleshooting 13−73
13−FAN CLUTCHES Table of Contents
13 − 2
Part Number Type Page #104750X S 13−27104756X S 13−27104758X S 13−19104760X S 13−19104761X S 13−23104770X S 13−27104778X S 13−26104782X S 13−31104870X S 13−19104871X S 13−23104872X S 13−25104873X S 13−31104877X S 13−22104878X S 13−28104880X S 13−24104885X S 13−31104890X S 13−32104894X S 13−23104896X S 13−21104900X S 13−33104901X S 13−18104902X S 13−26104904X S 13−22104905X S 13−19104965X S 13−26104990X S 13−19106724X S 13−26106970X S 13−29107942X S 13−29288610X S 13−30288615X S 13−20288626X S 13−20288636X S 13−19RF238713FA S 13−68RF238713RA S 13−68RF35029 S 13−67RF35030 S 13−67RF35031 S 13−67RF36029 S 13−67RF36030 S 13−67RF36031 S 13−67RF590000X S 13−49RF590001X S 13−51RF590002X S 13−49RF590003X S 13−54RF590004X S 13−54RF590005X S 13−37RF590007X S 13−37RF590008X S 13−48RF590009X S 13−55RF590010X S 13−43RF590011X S 13−55RF590012X S 13−42RF590013X S 13−42RF590014X S 13−34RF590015X S 13−34RF590016X S 13−43RF590017X S 13−43RF590018X S 13−55RF591000X S 13−50RF591001X S 13−44RF591002X S 13−38RF591003X S 13−38RF591004X S 13−52RF591005X S 13−39RF591006X S 13−52RF591007X S 13−40RF591008X S 13−40RF591009X S 13−53RF591010X S 13−53RF591011X S 13−56RF591012X S 13−36RF591013X S 13−40RF591014X S 13−39RF591015X S 13−35RF591016X S 13−50RF591017X S 13−41RF591018X S 13−44RF591019X S 13−53RF591020X S 13−39RF591021X S 13−45
Part Number Type Page #RF591022X S 13−45RF591023X S 13−57RF591024X S 13−56RF591025X S 13−35RF591026X S 13−53RF591027X S 13−41RF591028X S 13−36RF591029X S 13−46RF591030X S 13−46RF591031X S 13−58RF591032X S 13−46RF591033X S 13−58RF591034X S 13−47RF790000X S 13−49RF790001X S 13−51RF790002X S 13−49RF790003X S 13−54RF790004X S 13−54RF790005X S 13−37RF790007X S 13−37RF790008X S 13−48RF790009X S 13−55RF790010X S 13−43RF790011X S 13−55RF790012X S 13−42RF790013X S 13−42RF790014X S 13−34RF790015X S 13−34RF790016X S 13−43RF790017X S 13−43RF790018X S 13−55RF791000X S 13−50RF791001X S 13−44RF791002X S 13−38RF791003X S 13−38RF791004X S 13−52RF791005X S 13−39RF791006X S 13−52RF791007X S 13−40RF791008X S 13−40RF791009X S 13−53RF791010X S 13−53RF791011X S 13−56RF791012X S 13−36RF791013X S 13−40RF791014X S 13−39RF791015X S 13−35RF791016X S 13−50RF791017X S 13−41RF791018X S 13−44RF791019X S 13−53RF791020X S 13−39RF791021X S 13−45RF791022X S 13−45RF791023X S 13−57RF791024X S 13−56RF791025X S 13−35RF791026X S 13−53RF791027X S 13−41RF791028X S 13−36RF791029X S 13−46RF791030X S 13−46RF791031X S 13−58RF791032X S 13−46RF791033X S 13−58RF791034X S 13−47RF791035X S 13−35RF791036X S 13−47RF791037X S 13−56RF791038X S 13−41RF791039X S 13−59RF791040X S 13−59RF791041X S 13−59RF993249 S 13−63RF993272 S 13−63RF993282 S 13−63RF993284 S 13−63RF993286 S 13−63RF993293 S 13−63RF993294 S 13−63RF993295 S 13−63
Part Number Type Page #RF993296 S 13−63RF993427 S 13−63RF993428 S 13−63RF993603 S 13−62RF993605 S 13−62RF993606 S 13−62RF993607 S 13−62RF993610 S 13−62RF993615 S 13−62RF993616 S 13−62RF993617 S 13−62RF993619 S 13−62RF993625 S 13−62RF993630 S 13−62RF993653 S 13−62RF993654 S 13−62RF993655 S 13−62RF994002 S 13−63RF994039 S 13−61RF994052 S 13−61RF994072 S 13−61RF994073 S 13−61RF994074 S 13−61RF994105 S 13−60RF994116 S 13−60RF994117 S 13−60RF994155 S 13−60RF994156 S 13−60RF994205 S 13−66RF994307 S 13−64RF994314 S 13−65RF994315 S 13−65RF994342 S 13−64RF994343 S 13−64
Part Number Type Page #
Type "O" = OEM P/N, Type "S" = Service P/NIf OEM part # is not found on page listed, refer to the MCR for applicable cross reference.
Part Number Index 13−FAN CLUTCHES
13 − 3
PURPOSE OF THIS SECTIONThis section is designed as a reference for Haldex Commercial Vehicle Systems new and remanufactured air brake systemcomponents and accessories, sold under the Haldex and Midland product names. Products described include all pertinentinformation needed to replace an OEM installed component, or to help design an original installation. If there is a servicenumber for a given part, it is noted in the product number table.
DESIGN FLEXIBILITYThe products presented in this section are described by function and usage. Technical data and mounting configurationsare also provided. Throughout this section, reference is made to numerous specific OEM applications. This section is not,however, intended to be a mutually exclusive listing of all part numbers and designs available. Should the need for a designnot presented occur, contact your Haldex Commercial Vehicle Systems sales representative for additional information.
WARRANTY INFORMATIONProper service and repair are important to the safe, reliable operation of any motor vehicle. To prevent personal injuryand/or vehicle damage, careful and cautious service procedures recommended by the vehicle manufacturer should befollowed by anyone servicing a motor vehicle. For details on warranty of Haldex Commercial Vehicle air brake systemcomponents and accessories, refer to L20221 Aftermarket Warranty Policy. For warranty returns, use L90005 WarrantyAdjustment Form. To obtain further information, visit the www.hbsna.com website and click on Terms/Policies button,then on Warranty Returns.
ORDERING PROCEDUREMost customers can place electronic orders on the www.hbsna.com website by obtaining a username and password or byusing EDI. For additional information about electronic orders or to place an order by phone or fax, contact CustomerService in U.S. or Canada at numbers listed below:
U.S. Customer Service: Canada Customer Service:Phone: 800−643−2374 Phone: 800−267−9247Fax: 800−533−1941 Fax: 519−826−9497Mail: Commercial Vehicle Systems
North American Sales DivisionAttn: Customer Service Department10707 NW Airworld DriveKansas City, MO 64153−1297
Mail: Commercial Vehicle SystemsHaldex LimitedCanadian Distribution CentreAttn: Customer Service Department525 Southgate Drive, Unit 1Guelph, Ontario N1G 3W6
IMPORTANT NOTICEThe data listed herein is correct to the best of Haldex Commercial Vehicle Systems knowledge and belief, having beencompiled from reliable and official sources of information. However, HALDEX COMMERCIAL VEHICLE SYSTEMSCANNOT ASSUME ANY RESPONSIBILITY for possible error or misapplication of the product. Final determination of thesuitability of the products for the use contemplated by the Buyer is the sole responsibility of the Buyer. Haldex CommercialVehicle Systems shall have no responsibility in connection with this suitability. It is not our intention to imply that any of thecomponents in this catalog in connection with an engine make or model are made by any engine manufacturer.
Copyright 2003Haldex Commercial Vehicle Systems
10707 N.W. Airworld Drive
Kansas City, MO 64153−1215
All rights reserved.Materials may only be reproduced with written permission of Haldex Commercial Vehicle Systems.
13−FAN CLUTCHES Foreword
13 − 4
WHAT YOU NEED TO LOOK FOR:
Core is complete and not disassembled. The fan clutch core must include a bracket, sheave, PFD (pistonfriction disk),and an air chamber.
1.
The fan clutch core cannot be broken, cracked, welded or galled.2.
The sheave and air chamber must spin freely.3.
Core has not been damaged by non−operational causes such as fire, rust, or rough handling.4.
The fan clutch core must be a part number specified by Haldex that is acceptable for exchange.5.
APPLICABLE CREDIT:
If none of the above conditions exist (1, 2, 3 or 4), full credit is applicable.1.
If any one of the above conditions exist, fifty percent (50%) credit is applicable.2.
If two or more of the above conditions exist, no credit is applicable.3.
Refer to Core Policy L00036 for additional information on core credits, core returnprocedures, core changes, core acceptance, core refunds, and freight.
PRINCIPLE COMPONENTPARTS:
PROCEDURES FOR CORE IDENTIFICATION:
A. Sticker Check A "Good" core should have a product number which matches the listed acceptableproduct numbers. (If sticker is not available, go to steps B & C).
B. Visual Check A "Good" core should match match one of the graphics and notes listed on thefollowing pages.
C. Casting Check A "Good" core should have casting numbers which match one of the listed castingnumbers on the following pages.
CASTING NUMBER LOCATIONS:
Sheave On the edge of the back rim
Bracket Front surface near shaft
Air Chamber Front surface (smooth type has no casting numbers)
Core Return Guidelines 13−FAN CLUTCHES
13 − 5
REMANUFACTURED BENDIX® − APPLICATION GUIDE
VEHICLE MODEL &YEAR ENGINE MAKE & MODEL
MIDLAND SERVICE NUMBER
FD−1ASSEMBLY
FD−3(STANDARD)ASSEMBLY
FD−3 ASSY.(2.56 PILOTDIAMETER)
BROCKWAY
1975−78 ALL1975−78 ALL1975−78 ALL
Cummins NTC & PT SeriesCummins NTC & PT SeriesDetroit 8V71, N, T
288626X288615X288610X
104872X104871X104873X
−−−
FORD
1977−79 CL90001984 L, LT, LTS, LTL−90001973−79 ALL "L"1980 & Up ALL "L" EXCEPT LTL1981 & Up LTL1981 & Up LTL1973−76 W, WT90001977 & Up CL, CLT, 90001983−84 LTN 90001975−79 ALL "L"1974−79 ALL "L"
Caterpillar 3406Caterpillar 3406
Cummins NTC SeriesCummins NTC Series
Cummins NTC 300Cummins NTC 350, 400Cummins NTC SeriesCummins NTC Series
Cummins L−10Detroit 8V71TDetroit 8V71N
288636X−
−−
−−−−
−−−
104870X104758X
104770X104750X
104750X104750X104770X104761X
−104890X104782X
−104760X
−104756X
104756X104756X−−
104778X−−
FREIGHTLINER
1970 & Up ALL1975 & Up ALL1970−74 ALL1975 & Up ALL
1975 & Up ALL1975 & Up ALL1974 & Up ALL1974 & Up ALL1974 & Up ALL1970 & Up ALL1975 & Up ALL
Overtemp warning switch is too faraway from the fan temp switch.
3.
Temp gauge is faulty (reads high).4. Fan temp switch is faulty.5.
Check solenoid plumbing.Replumb solenoid valve.
1.
Replace overtemp warningswitch.
2.
Move overtemp warning switchas close to the fan temp switchas possible.
3.
Replace temp gauge.4.
Replace fan temp switch.5.
Fan engages at low enginetemperatures while vehicle ismoving.
Normal condition in extremely hotweather or at slow vehicle speeds inwarm weather.
1.
Faulty temp gauge.2.
A/C system overcharged or condensercovered with debris.
3.
Refrigerant pressure switch may befaulty.
4.
Fan temp switch is faulty, if fanengages at low engine temp and A/Cis OFF.
5.
Normal condition in hotweather.
1.
Replace temp gauge orsender.
2.
Check A/C system.3.
Replace pressure switch ifnecessary.
4.
Replace fan temp switch.5.
Fan won't run under anycondition. Air line may be leaking (Horton/Evans
air−on fan drives).1.
Wiring may be shorted and/or fuses,circuit breakers blown.
2.
Air solenoid may be faulty. Test airsolenoid valve by shorting across theterminals of the temp switch toenergize the air solenoid valve and toactivate the fan drive.
3.
Check air lines. Fix wherenecessary.
1.
Check wiring, fuses, and circuitbreakers.
2.
If solenoid does not activate,replace solenoid.
3.
13−FAN CLUTCHES Troubleshooting
13 − 70
Normally Closed Fan Clutches
Problem Possible Cause Solution
Fan runs all the time whenthe air conditioning is OFF. Manual override switch is ON.1.
Air solenoid valve may be faulty orplumbed incorrectly.
2.
Air line to clutch may be leaking(Bendix/Kysor air−off fan drives).
3.
Fan temp switch may be stuck open;with engine temp below 180°F shortacross terminals, if fan turns off,switch is faulty.
4.
Pressure switch may be stuck open;turn off A/C system, if fan continues torun, short across pressure switch, iffan stops, pressure switch isdefective.
Fan runs all the time whenthe air conditioning is ON. This is a normal condition in
extremely hot weather; spray wateron A/C condenser (fan shoulddisengage for a short period of timeand then re−engage after waterevaporates).
1.
Air conditioning system may beover−charged or condenser coveredwith debris. Turn OFF the A/Csystem; if the fan stops, therefrigerant pressure switch isfunctioning.
2.
Pressure switch may have drifted outof calibration; use pressure gauge tocompare actual fan−on and fan−offpressures vs. specified pressures.
3.
Normal condition in hotweather.
1.
Service A/C system. CheckA/C pressure and condenser.
2.
If out of calibration, replacepressure switch.
3.
Fan operation is erratic.Loose electrical connection.1.
Fan temp or pressure switch may befaulty.
2.
Check wiring; fix wherenecessary.
1.
If other system componentsand connections check outokay, (a) replace pressureswitch if erratic fan operationis associated with airconditioning at idle or (b)replace fan temp switch if theerratic operation occursprimarily when the engine ishot.
2.
Fan cycles frequently whenengine is hot.
The fan should remain engaged long enoughto reduce temperature 7−10єF. The fan tempswitch is defective if the fan disengages afteronly a 3−4є reduction.
Replace fan temp switch.
Troubleshooting 13−FAN CLUTCHES
13 − 71
Normally Closed Fan Clutches
Problem Possible Cause Solution
Fan cycles frequently whenvehicle is stationary with A/CON.
Up to 4 cycles per minute is a normal conditionfor conventional control systems; turn off airconditioning system and cycling should stop.
To reduce cycling by up to 90%, installan Index K7 fan control system.
Fan turns on wheneverignition is on (turns off whenengine gets hot).
Air solenoid valve plumbed backwards. Check solenoid installation instructions;plumb correctly.
Control system fuses blown.If fuse blows whenever the ignition isturned on, the problem is most likelyrelated to a fault in the wiring.
1.
If the fuses blow only when the fanengages, the fault is probablyassociated with the solenoid valve.
2.
Check wiring, fix wherenecessary.
1.
Use an ohmmeter to check fora shorted solenoid coil (thecoil resistance should begreater than 14 ohms). Ifshorted, replace air solenoidvalve.
2.
13−FAN CLUTCHES Troubleshooting
13 − 72
Normally Open Fan Clutches
Problem Possible Cause Solution
Fan won't engage whenmanual override is turned on.
Manual override switch, air solenoid valve orrelated plumbing or wiring is faulty.
Replace faulty component.
Fan won't cycle on when airconditioning test is performed.
Outside air temperature is too low, there is alow refrigerant charge or refrigerant pressureswitch is faulty.
Check air conditioning system.1. Replace pressure switch ifrequired.
Overtemp warning switch is too faraway from the fan temp switch.
3.
Temp gauge is faulty (reads high).4. Fan temp switch is faulty.5.
Check solenoid plumbing.Replumb solenoid valve.
1.
Replace overtemp warningswitch.
2.
Move overtemp warning switchas close to the fan temp switchas possible.
3.
Replace temp gauge.4.
Replace fan temp switch.5.
Fan engages at low enginetemperatures while vehicle ismoving, with air conditioningON.
Normal condition in extremely hotweather or at slow vehicle speeds inwarm weather.
1.
Faulty temp gauge.2.
A/C system overcharged or condensercovered with debris.
3.
Refrigerant pressure switch may befaulty.
4.
Fan temp switch is faulty if fanengages at low engine temp and A/Cis OFF.
5.
Normal condition in hotweather.
1.
Replace temp gauge orsender.
2.
Check A/C system.3.
Replace pressure switch ifnecessary.
4.
Replace fan temp switch.5.
Fan won't run under anycondition. Air line may be leaking (Horton/Evans
air−on fan drives).1.
Wiring may be shorted and/or fuses,circuit breakers blown.
2.
Air solenoid may be faulty. Test airsolenoid valve by shorting across theterminals of the temp switch toenergize the air solenoid valve and toactivate the fan drive.
3.
Check air lines. Fix wherenecessary.
1.
Check wiring, fuses, and circuitbreakers.
2.
If solenoid does not activate,replace solenoid.
3.
Troubleshooting 13−FAN CLUTCHES
13 − 73
Normally Open Fan Clutches
Problem Possible Cause Solution
Fan runs all the time whenthe air conditioning is OFF. Manual override switch is ON.1.
Air solenoid valve may be faulty orplumbed incorrectly.
2.
Air line to clutch may be leaking(Bendix/Kysor air−off fan drives).
3.
Fan temp switch may be stuck closed;with engine temp below 180°Fdisconnect wiring, if fan turns off,switch is faulty.
4.
Pressure switch may be stuck closed;turn off A/C system, if fan continues torun, disconnect wiring to pressureswitch, if fan stops, pressure switch isdefective.
Fan runs all the time whenthe air conditioning is ON. This is a normal condition in
extremely hot weather; spray wateron A/C condenser (fan shoulddisengage for a short period of timeand then re−engage after waterevaporates).
1.
Air conditioning system may beover−charged or condenser coveredwith debris. Turn OFF the A/Csystem; if the fan stops, therefrigerant pressure switch isfunctioning.
2.
Pressure switch may have drifted outof calibration; use pressure gauge tocompare actual fan−on and fan−offpressures vs. specified pressures.
3.
Normal condition in hotweather.
1.
Service A/C system. CheckA/C pressure and condenser.
2.
If out of calibration, replacepressure switch.
3.
Fan operation is erratic.Loose electrical connection.1.
Fan temp or pressure switch may befaulty.
2.
Check wiring; fix wherenecessary.
1.
If other system componentsand connections check outokay, (a) replace pressureswitch if erratic fan operationis associated with airconditioning at idle or (b)replace fan temp switch if theerratic operation occursprimarily when the engine ishot.
2.
Fan cycles frequently whenengine is hot.
The fan should remain engaged long enoughto reduce temperature 7−10єF. The fan tempswitch is defective if the fan disengages afteronly a 3−4єF reduction.
Replace fan temp switch.
13−FAN CLUTCHES Troubleshooting
13 − 74
Normally Open Fan Clutches
Problem Possible Cause Solution
Fan cycles frequently whenvehicle is stationary with A/CON.
Up to 4 cycles per minute is a normal conditionfor conventional control systems; turn off airconditioning system and cycling should stop.
To reduce cycling by up to 90%, installan Index K7 fan control system.
Fan turns on wheneverignition is on (turns off whenengine gets hot).
Air solenoid valve plumbed backwards. Check solenoid installation instructions;plumb correctly.
Control system fuses blown.If fuse blows whenever the ignition isturned on, the problem is most likelyrelated to a fault in the wiring.
1.
If the fuses blow only when the fanengages, the fault is probablyassociated with the solenoid valve.
2.
Check wiring, fix wherenecessary.
1.
Use an ohmmeter to check fora shorted solenoid coil (thecoil resistance should begreater than 14 ohms). Ifshorted, replace air solenoidvalve.