Hello, does anyone know what is this button for? because when it is activated on my loader, nothing changes. In my oppinion, shouldn´t the loader be stopped getting forward whitout any torque, while I´m lifting the bucket beside a truck and pressing the brake with some acceleration? If yes, what can be done to check this problem? I really appreciate any helpfull answer. Gerry
If you press the bottom of the switch does your transmission neutralize when you press the brakes or is the loader still trying to drive through the brakes..? If you press the top of the switch this should over-ride the transmission neutralizer. Operating the machine in this condition could result in increased brake wear. A machine Serial Number would be helpful.
Hello Nige, thank you for help! Serial Number is AAN00536, year 2000. Yes, when I press left brake, transmission still tryes to go forward with some accelaration.
The current/signal from the neutralizer switch goes to a pressure switch (one of two - have to get the correct one) mounted on the brake control valve under the cab floor. It is that pressure switch closing (or not as the case may be) that decides if a signal is sent to the Electronic Transmission control. I suggest the following as first steps:- 1. Use a digital multimeter to test that the neutralizer switch on the panel is opening/closing correctly by measuring the resistance between terminals 1 & 2 (wires 702 orange and 202 black). 2. If the neutralizer switch tests out OK move to the low pressure switch mounted on the brake valve. It's the uppermost of two pressure switches that appear identical. Look for wires 702 orange and 720 purple. When you have good air pressure that switch should be closed. The switch has 3 wire connections, A, B, & C. The NC connections (when air pressure is low) are A & C. The NO connections (when air pressure is good) are A & B. You should be able to watch the switch status change from NC to NO as the air pressure rises if you start the machine with empty air tanks and slowly build up the air pressure If you want a copy of the Electrical Schematic please send me a PM with your email address.
Respectfully Nige I don't believe a 924G has an air over hydraulic system.
You're correct - it's full hydraulic. I must have somehow associated "pressure switch" with air pressure and didn't check the SysOp before posting. My bad. The brake valve is located under the front side of the operator's cab floor. It looks like this and the low pressure switch is the upper one (circled). To test the low pressure switch do the following: - 1. Run the engine until the brake hydraulic system then turn off the engine. 2. Turn the keyswitch back to the "on" position but do not start the engine. 3. Disconnect the wiring harness at the low pressure switch and check the continuity between terminals A & B (black wire and red wire). The switch contacts should be closed so there should be zero resistance or close to it. 4. Press the brake pedal numerous times until the brake accumulator completely discharges. At some point during that process when the pressure goes below 75psi the switch contacts should open (infinite resistance). If it does then that proves it's working OK.