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Wonder if your butterfly is sticking? Do you get a check engine light? What does “limp mode” mean? Regardless of wether the switch is in the ex brake position, as soon as you switch it off or touch the accelerator, the ex brake butterfly should immediately swing open… got a webcam or wireless...

Yep, CB22 is the easiest way on an A0 To de-energize the fan solenoid and engage the fan. If this is an A1, the ECU provides the power, so the easiest way to manually engage the fan is under the passenger dash and un-plugging the fan solenoid… The solenoid when energized provides air to the...

Well that sounds weird. Do you get immediate throttle response when you step on the accelerator while the switch is still turned on? On the A1/A1R, the ECU is the source power for the exhaust brake. I would say the ECU only provides that power when the TPS/pedal is in the idle position. The...

The fan is activated by removing 28V. The 205F thermal sw in the upper rad pipe on an AO opens the circuit when if reaches that temp. Easiest way to turn it on is to pull the CB for the circuit. want to say it is CB22, but need to confirm that... you can also remove the passenger kickpanel...

Remove the two forward batteries, or the two rear batteries. Take the connections from the batteries you removed and move them toward the front or rear and re-attach them…

True for every Allison... If that input is programmed for PTO(or something else/not programmed like mine is), it cannot of course provide the preselected downshift… The lockup function, 100% LU/engine hard coupled to the transmission in 3rd and above, is a normal part of the Allison shift...

On the Allison, it enters lockup in our 3rd gear when turbine RPM approaches input RPM. It stays locked up 100% of the time all the way up thru 7th and back down thru 3rd. It drops out of lockup in 3rd most likley when it senses the downshift to 2nd is iminent. The main thing the pacbrake...

Wooah… Stereo…

You probably should clarify that a little. Jake brakes are illegal/restricted in many places because they are obnoxiously noisy when they start popping their pressure relief(BAA, BAA, BAA,BAA, BAA)… the signs I am used to seeing are worded something like this: “Unmuffled Jake brakes...

Yep, when you switch the switch to warmup, it sends power provided by the neutral relay directly to the ex brake solenoid and the dash light…

I have driven several vehicles with ex brake and none have operated the brake lights. No ex brake vehicle I have ever driven has ever lifted the EX brake when you press the brake pedal, only when you press the accelerator... you should be able to use the two brake modes together... I...

In the A1 they are all 12v coil, either 4 or 5 pin. If you look at the schematic, for all the relays that are controlled by 24V, there is a resistor placed in series with the coil to dissipate the excess(adapt a 12v relay to a 24v power source)…

Perhaps that would be about the ideal, but I don’t know that 7th will be unusable with the 3.9. If peak torque is 1450-1550 RPM, 60MPH in 7th is only going to be ~100-200 RPM below peak torque. 6th and 7th are not really very far apart with 7th being about 87% of the 6th gear ratio(smallest...

TPS resistance should be between 9000 and 15,000 ohms(9-15 Kohms) measured pin A-C. A-B should measure a smooth transition between ~500 ohm to within 500 Ohms of the overall value measured between pins A-C as the TPS/throttle is moved thru its complete range.

Remember to have the cab fully raised and a crutch installed as opening the latch opens the hydraulic circuit that lifts the cab.…

Testing is relatively easy. It has a 3 terminal connector. The end two terminals measure across the resistor, about 14,500 ohms if I recall(let me look it up). The center to either end terminal is the wiper that rides on the resistor, and should be within 500 ohms of one end and 14,000 of the...

Yea I wish that info was a little easier to find for the 3116, that and the engagement torque figures(usually specced around 800 RPM for manual transmissions/clutches). Cat made so many different tunes of the 3116 engine for customers it isn’t funny. I ran across an Eaton clutch table that...

I suspect that is what he is experiencing also, Or the TPS is not indicating that to the TCU. The TPS input has a MAJOR effect on how these transmissions shift.

When upshifting, the transmission goes into lockup somewhere in our 3rd gear and turbine RPM and TC housing(input) RPM approach one another. I suspect that is why the 2-3 shift seems to hit harder than the others(that and its a bigger jump). The trans stays in lockup continuously thru all...

Its a hollow spring steel roll pin. You have to use a flat tipped punch/drift large enough to engage it all the way around the edge, but it should tap right out. If it wont move one way, tap from the other direction. You can squirt a little penetrating oil into the hollow pin to help loosen...