Maintenance Procedures for 37H Air Release Style Topplate - JOST ...

MAINTENANCE PROCEDURESFor JSK 37H Fifth Wheelwith Air ReleaseWARNING1. FAILURE TO FOLLOW THESE INSTRUCTIONSCOULD CAUSE A HAZARDOUS CONDITION!2. PERFORM ALL MAINTENANCE WITHTRACTOR UNCOUPLED FROM TRAILER.3. ALL PROCEDURES MUST BE PERFORMED BYQUALIFIED PERSONNEL.A. LUBRICATION (as required):1. Lubricate the kingpin lock using a hand pump grease gun through the greasezerk provided on the skirt of the fifth wheel (see figure 1).2. Apply a lithium-based grease with EP additive (extreme pressure) to thetrailer contact surface of the fifth wheel.3. Apply a light oil to all moving parts.4. For sliding fifth wheels spray diesel fuel on slide path of the base plate.Grease here using ahand grease gun.CAUTION: DO NOTUSE A POWERGREASE GUN. THEPRESSURE WILLDAMAGE THE LUBELINE.1Lock Nut2AdjustmentScrewFIGURE 1B. INSPECTIONS AND ADJUSTMENTS:(Perform the following every 3 months or 30,000 miles)1. Inspect the mounting – repair or replace any missingor damaged fasteners or broken components.2. Inspect bracket pin bolts, make sure locking tabs areproperly securing the bolts in place (see figure #3).3. Inspect the fifth wheel for bent, worn or broken parts.Replace with genuine parts.4. Inspect the retractable handle – handle must freelyextend and retract through the entire range available.Replace with a new retractable handle if damaged.The right to alter specifications is reserved.FIGURE 2Locking tabs properly securing boltsFIGURE 3Page 1 of 31770 Hayes StreetGrand Haven, MI 49417www.jostinternational.comPh. (616) 846-7700 (800) 253-5105Fax (616) 846-0310LT SK37A-03 Rev.G

5. Check adjustment - Lock and unlock several times using a lock tester. Checkthat the locking mechanism functions properly (see operating procedures).a. The lock is properly adjusted if: The wheellocks and unlocks easily each time and thelock tester rotates freely.b. The lock is too loose if: You feel fore-aftplay when pulling and pushing on thelock tester handle (see figure 4)c. The lock is too tight if: The lock tester doesnot rotate freely when attempting to rotateit in the lock. (See figure 5)Look for movementof kingpin in lockEngage HookDisengage HookRotate LockTesterPull & PushHandleFIGURE 4 FIGURE 56. Correct improper adjustment.a. IF IT IS TOO TIGHT: loosen the jam nut(see figure 2 item 1), turn the adjustmentscrew (see figure 2 item 2) clockwise onefull turn and reset the jam nut. Then, lockand unlock several times, repeat ifnecessary.TURN ADJUSTMENT SCREWCLOCKWISE COUNTER CLOCKWISEb. IF IT IS TOO LOOSE: loosen the jam nut,turn the adjustment screw counterclockwiseone full turn and reset the jam nut. Then,lock and unlock several times, repeat ifnecessary.IF TOO TIGHTIF TOO LOOSEWARNINGDO NOT USE ANY FIFTH WHEEL THATFAILS TO OPERATE PROPERLY!The right to alter specifications is reserved.Page 2 of 31770 Hayes StreetGrand Haven, MI 49417www.jostinternational.comPh. (616) 846-7700 (800) 253-5105Fax (616) 846-0310LT SK37A-03 Rev.G