Cab-Tilt System 60 - alfp.net

1 General InformationThe Cab-Tilt System has three major parts: A hydraulic pump consisting of a pump body, areservoir, and a pump control lever. A hydraulic tilt cylinder that raises and lowersthe cab. A tilt safety stop on the tilt cylinder, which mustbe used when working under a cab that hasnot been fully cab can be tilted open to 42 degrees to accessthe engine and other components. A hydraulic pump,located behind the right side of the cab, is used tooperate the hydraulic cab tilt mechanism. SeeFig. tilt cylinder is connected to the pump by flexiblehigh-pressure lines. Velocity fuses are built into thetilt cylinder port. They act as check valves to preventthe cab from free falling in case of hydraulic systemdamage, such as a ruptured : Whenever raising or lowering the cab,stop working the pump once the cab goes overcenter.

2 The cab falls at a controlled rate andcontinued pumping could lock up the tilt cylin-der. To slow the descent of the cab, reverse Lock-UpHydraulic lock-up can occur for the following rea-sons: Very cold weather Use of the wrong hydraulic fluid Air in the System Sudden cab movement A ruptured hydraulic lineAny of the above situations will cause the velocityfuses to function as safety check valves, and lock upthe tilt cylinder. To unlock the cylinder, the cab mustbe moved in the opposite direction of : If the tilt cylinder locks up, checkfor a major problem (such as a ruptured line orleaking fitting) before trying to unlock the tilt cyl-inder. If such a problem is found, make any nec-essary repairs before unlocking the example, if the cab is moving toward the full-tiltposition when the lock-up occurs, move the controllever to RETURN, and work the pump a few will unlock the cylinder.

3 Move the control leverto tilt , and allow the cab to descend to a the cab is moving toward the lowered (operating)position when the lock-up occurs, move the controllever to tilt , and work the pump a few strokes. Thiswill unlock the cylinder. Move the control lever to RE-TURN, and allow the cab to descend to the , Cab tilt PumpCab- tilt InformationCondor Workshop Manual, Supplement 0, January 2000050/1 Tilting the CabCAUTIONB efore tilting the cab, make sure the vehicle isparked on level ground, both side-to-side andfront-to-rear. Tilting the cab while the vehicle isparked on uneven ground (such as a slopinghighway shoulder) may damage the cab mountsand prevent you from returning the cab to theoperating tilting the cab, make sure there is ad-equate clearance in front of the vehicle, and thatthe area is free of people and all not tilt the cab with the engine running.

4 tilt -ing the cab could engage the transmission. If theengine is running, the vehicle can move, causingan accident that could result in personal injury orproperty : Before raising or lowering the cab,read the warning label on the hydraulic Park the vehicle on a level surface, apply theparking brakes, shut down the engine, and chockthe rear Secure all loose articles in the cab and makesure the doors are securely falling in the cab, or a door flying open,could damage the vehicle or cause personal Make sure there are no people or objects in thepath the cab will be Move the pump control lever to tilt Remove the pump handle from behind the pri-mary driver s seat and attach it to the Raise and lower the pump handle several timesto unlock the cab : Check the indicator pin on eachcab latch.

5 The latches have disengaged if thepins are out. SeeFig. : If air is present in the hydraulic tilt sys-tem, the pump operation may seem spongy orineffective. If this happens, bleed the air fromthe System . SeeSubject 100for Continue to operate the pump handle until thecab is tilted open about 30 : If the cab stops moving while it isbeing raised, do not force it to move with the tiltpump. The velocity fuses have locked up the tiltcylinder. To unlock the tilt cylinder, see "Hydrau-lic Lockup of Cab tilt System ", inSubject Put the safety stop on the tilt cylinder in safety stop prevents the cab from droppingbelow a specific angle. SeeFig. sure the tilt safety stop is pushed downonto the tilt cylinder rod.

6 If the tilt safety stop isnot engaged, and the cab drops, the result couldbe serious injury or Continue to operate the pump handle until thecab has reached the 42-degree, fully open , Cab Mount Indicator PinCab- tilt TiltingCondor Workshop Manual, Supplement 0, January 2000060/1 Lowering the CabDANGERStay completely clear of the cab s travel path atall times. Once the tilt safety stop has been re-leased, do not lean over the frame rails, the en-gine, or the transmission for any reason. To doso could result in serious injury or Secure all loose articles in the cab and makesure the doors are securely Make sure the parking brakes are applied andthere are no obstructions in the cab travel Lift the safety stop up until it no longer rests onthe tilt cylinder rod.

7 SeeFig. 3. The cab mayneed to be raised if the safety stop is restingagainst the tilt cylinder Move the pump control lever to the RETURN position. The cab will automatically begin to re-turn to the operating : To slow the descent of the cab, reversethe tilt pump After the cab is completely lowered, check theindicator pin on each cab mount. The cabmounts are locked when the pins have movedback into the piston and the cylinder spring as-sembly. If the pins are out, the cab mounts arenot locked. SeeFig. 1. Raise and lower thepump handle until the cab is completely loweredand the cab mounts are : If the cab stops moving while it isbeing raised, do not force it to move with the tiltpump.

8 The velocity fuses have locked up the tiltcylinder. To unlock the tilt cylinder, see "Hydrau-lic Lockup of Cab tilt System ", inSubject Make sure the pump control lever is in the RE-TURN Remove the pump handle and return it to itsstored Remove the chocks from the tilt -Cylinder Rod2. tilt Safety , tilt Safety Stop Positioning04/15/93f310358a1231. tilt Safety Stop2. tilt -Cylinder Rod3. tilt , Releasing the tilt Safety StopCab- tilt TiltingCondor Workshop Manual, Supplement 0, January 2000060/2 Bleeding the SystemA "spongy" feeling (cylinders do not move when thepump handle is operated) indicates air in the cab-tiltsystem. Use the following procedures to remove theair from the Cab-Tilt : With the exception of bleeding thepullport fittings on the tilt cylinders, and the hy-draulic cab latches, never bleed any part of thesystem while the cab is the tilt CylinderDANGERB efore doing the work below, review the cab tilt -ing information inSubject 060.

9 Failure to read thewarnings and to be aware of the dangers of tilt -ing and returning the cab could result in seriousinjury or Park the vehicle on a level surface, apply theparking brakes, shut down the engine, and chockthe rear With the cab completely returned and the tilt cyl-inder retracted, loosen thepushport fitting onthe tilt cylinder. Do not disconnect the hose fromthe fitting. Place the control lever in the tilt po-sition, and operate the tilt pump until a bubble-free stream of hydraulic fluid flows from thepushports on the tilt Tighten thepushport fitting on the tilt Fill the tilt pump reservoir until hydraulic fluid ap-pears in the fill port. Install and tighten the fillplug.

10 SeeSpecifications, 400for the specifiedhydraulic fluid. Do not use engine oil, brake fluid,or automatic transmission tilt the cab to the full- tilt position. SeeSub-ject Loosen thepullport fitting on the tilt the control lever in the RETURN position,and operate the tilt pump until a bubble-freestream of hydraulic fluid flows from thepullportfitting on the Tighten thepullport fitting on the tilt completely clear of the cab s travel path atall times. Once the tilt safety stop has been re-leased, don t lean over the frame rails, the en-gine, or the transmission for any reason. To doso could result in serious injury or Return the cab to the operating position. SeeSubject Fill the tilt pump reservoir until hydraulic fluid ap-pears in the fill port.