PS Magazine - TB 43-PS-644
PS, The Preventative Maintenance Monthly
ISSUE 644
JULY 2006
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ECHANICS= REPLACING A FAILED RAMP CONTROL VALVE ON AN -115!5 VEHICLE CAN CAUSE EVEN
MORE PRO\LEMS IF IT
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S NOT DONE RIGHTQ 4HAT STARTS WITH GETTING THE
RIGHT
REPLACEMENT VALVEQ
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4HE OLD.STYLE RAMP CONTROL VALVE= 030 >B2:.::.1?B.?>11= HAD AN E]TERNAL RELIEF VALVE
AND WAS REPLACED IN THE EARLY r;:SQ 4HE REPLACEMENT VALVE= 030 >B2:.:1.>11.122?= HAS AN
INTERNAL RELIEF VALVE \UILT INTO ITQ
4HE OLD.STYLE VALVE WAS DELETED FROM THE SUPPLY SYSTEM AND PARTS MANUALSQ 4ROU\LE IS=
THERE ARE STILL SOME VEHICLES THAT HAVE THESE VALVES INSTALLEDQ
[HEN THESE VALVES FAIL= SOME MECHANICS uND IT EASIER TO PULL THE PART NUM\ER FROM THE
FAILED VALVE AND USE IT TO ORDER A NEW ONEQ
"IG MISTAKEQ 4HE OLD PART NUM\ER CROSSES TO A YET
ANOTHER
RELIEF VALVE= 030 >B2:.::.B2?.
?@2:Q 4HIS IS AN ADsUSTA\LE VALVE THAT HAS A PRESSURE LIMIT RANGING FROM 2=5:: TO 5=B:: PSIQ
ZOU WON
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T GET INSTRUCTIONS ON HOW TO ADsUST THE VALVEQ -OST MECHANICS WON
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T EVEN
REALItE THE VALVE HAS TO \E ADsUSTED TO 2=5:: PSI TO WORKQ
4HE RESULTp 6AMP FAILURE DUE TO THE E]TREME HYDRAULIC PRESSURE THAT E]CEEDS WHAT THE
RAMP CYLINDER CAN HANDLEQ
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-ECHANICS= \REAK THE HA\IT OF ORDERING FROM PART NUM\ERS ON FAILED PARTSQ )F YOU GO TO
THE PARTS 4-= YOU
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LL uND THE MOST UP.TO.DATE AND APPROVED PARTS FOR YOUR REPAIR sO\Q
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T
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S ALSO A GOOD IDEA TO GO AHEAD AND REPLACE
ALL
THOSE OLD E]TERNAL VALVES NOW TO HEAD
OFF PRO\LEMS LATERQ
8RDER THE CORRECT RAMP CONTROL VALVE= 030 >B2:.:1.>11.122?Q 4HEN TURN TO [9 :<<:
:: IN 4- ;.25?:.2@@.2:.?Q )T TELLS HOW TO REMOVE THE OLD HYDRAULIC RAMP CONTROL HANDLE=
HYDRAULIC LINES= AND E]TERNAL RELIEF VALVE uRSTQ 4HEN IT E]PLAINS HOW TO INSTALL THE NEW RAMP
CONTROL VALVEQ
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