case 120 calibration

lab man

lads can someone tell me how to calibrate a mxm 120 case tractor

lab man

bump

mad-for-tar

Get the oil good and hot, ideally do it after a days work or so or a while out on the road etc., to ensure everything is up to good temperature.

Turn off engine and ensure all electrics, a/c etc., are turned off.
Press and hold upshift switch on the gear lever and start the engine. Then inside 3 seconds or so, press the downshift switch after starting, to enter calibration mode. Take note of this step as if you dont do it, you wont get into the calibration mode. (Blue ones are easier as you have to press down both buttons at the same time whilst starting to get into calibration mode).
Handbrake on, put shuttle lever into forward, release the clutch and set engine speed to 1200RPM.

You should have H1 or a figure on the gear display on the right, if its a figure, its the transmission oil temperature. Ideally should be around 60 degrees or so but dont worry so much about it but try to get it as warm as possible beforehand to get good results. If its H1 on the display, pressing upshift switch once will get you to the temperature. Pressing it again you should get CL on display which means oil temp is low but ignore it. Press once again and you should get A on the display. This is the A clutch. Now press and HOLD the downshift switch to calibrate that clutch, you will see horizontal lines move upwards followed by numbers ramping up on the display. Hold onto the switch until it finishes that clutch and you see the display alternate between the letter A and the value (e.g 2 42 etc.).
Press the upshift switch to move onto clutch B and repeat the procedure for that clutch. Repeat then for clutches C, D and E.

When you get to F, press and hold downshift until you see CF on the display, this checks the position of the synchronizer stroke and sets the values for them. After you release, you should have N on the display or press the upshift to get to N, then press and hold downshift and wait till the display alternates between N and 750. this checks that the synchros are moving into correct position.

Reduce RPM and then switch off key for at least 5 seconds to store the values. Should be good to go then. If you get U codes at any stage during the process, either part of the steps are not correct or something has gone wrong during the process. Here they are below in case you come across them during the process.

U19 Oil temperature below 10 degrees centigrade
U21 Engine RPM too low
U22 Engine RPM too high
U23 Shuttle lever in neutral
U26 Clutch pedal not released
U31 Output speed sensed -- tractor moving
U33 Handbrake not applied
U34 Seat switch not activated
U36 Maximum allowed clutch calibration value exceeded
U37 ERPM dropped too soon during clutch calibration
U81 No medium/reverse range synchroniser movement sensed
U82 No low/high range synchroniser movement sensed
U83 Synchroniser potentiometer connectors swapped
U84 Reverse and high range synchroniser solenoid connectors swapped
U85 Medium and low range synchroniser solenoid connectors swapped
U86 Medium/reverse range synchroniser neutral error
U87 Low/high range synchroniser neutral error
U88 Medium/reverse range synchroniser calibration values out of tolerance
U89 Low/high range synchroniser calibration values out of tolerance

Hope it helps.

lab man

thanks mad for tar