Why does my 940 mustang skid steer creeps to the right even after i adjust the centraliser?

faulty control valve on that side leaking pressure to the drive motors

check tyre pressures first if correct about 2.2 bar ,then change the load/pressure switch on the steering rack ,it should be located where the drive goes into the steering rack ,unless you have a electric motor system and not hydraulic if this is the case then dealer only as the control unit is all electronic and has to be centralised ,if some unskilled know it all has adjusted tracking but only on one arm then steering wheel spokes will be out of position and this will cause big problems .

press the helpful button and check links below manuals for the 940

http://file.seekpart.com/keywordpdf/2011/3/30/2011330111313348.pdf

Mustang Steer Loader 940 Parts Manual

Misc Tractors Mustang 2040 Skid Steer Loader Manual Service Repair Owners...

mustang 940e skid steer manual special

well the relay (or park bypass) for that function is right next to the main fuse panel , I do believe on that model is under the cover by the operators right knee , the parking bypass solenoid is the first valve on the valve block , Follow the hose off the pump to the valve block , it looks different than the others as it's only a single coil type , all the others on that block have two coils , this is the bypass valve , but I will say unless you specifically know there's something wrong with that valve , that's not going to be your problem if it wont come out of park mode , its always a safety switch holding it out !! finding it , now there's a challenge , id just hate to see you waste 90 bucks on a valve an it still wont come off park mode

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You most likely have something in the steering that is binding up.

Check the ignition fuse.

Hi Shann, if some one removed the rack or the steering column and fittei withoutd first alingning, that will be the problem. Sollution is to centralised wheels to striaght ahead position and then remove coupling between column and steering rack centralise steering mwheel and reassemble. Regards Johngee10

Halfshaft -sorry but the diagrams didn't paste into the fixya.com window, just the text. Also, this was for a 3.2L engine.
REMOVAL & INSTALLATION

1. Before servicing the vehicle, refer to the precautions in the beginning of
   this section.
   
2. Remove or disconnect the following:
   
   
   
   • Negative battery cable
     
   • Front wheel
     
   • Radiator skid plate
     
   • Transfer case skid plate
     
   • Brake calipers and mounting bracket
     
   • Brake rotor
     
   • Wheel speed sensor
     
   • Steering knuckle
   
   
3. Support the axle housing with a jack. Unbolt the axle mounting bracket and
   remove the halfshaft/bracket assembly.
   To install:
   
   
4. Install or connect the following:
   
   
   
   • Axle/bracket assembly. Tighten the bracket flange bolts to 85 ft. lbs. (116
     Nm) and the bracket mounting bolts to 112 ft. lbs. (152 Nm).
     
   • Steering knuckle
     
   • Wheel speed sensor
     
   • Brake rotor
     
   • Brake caliper and mounting bracket. Tighten the bracket bolts to 115 ft.
     lbs. (155 Nm).
     
   • Transfer case skid plate. Tighten the bolts to 27 ft. lbs. (37 Nm).
     
   • Radiator skid plate. Tighten the bolts to 58 ft. lbs. (78 Nm).
     
   • Front wheel
     
   • Negative battery cable
   
   
5. Check the wheel alignment and adjust as necessary.
   
   
   
   
   
   Fig. 1: Exploded view of the left halfshaft, axle shaft and
   axle disconnect
   
   
   
   
   
   
   
   Fig. 2: Exploded view of the right halfshaft and mounting
   bracket
   
   

This is the PLAY in the steering box and can be adjusted to minimise in the penumatic section.
Tighten the tie rods ends and ccheck for any play in either ends. If not the play is from the steering column to the rack . You can tighten to make it fit closer BUT do not over tighten.
Now start the car and check the movement to either side.
If needs trimming do so , stop engine adjust and try again. Check for fluid in the system.