This characteristic of difficulty starting after your tractor has been idle for several days is common to your 5425 and many other John Deere 5425 models. Apparently the fuel system is losing its ability to prime.
There are a number of reasons why a 5×20 Series tractor can experience starting problems. This article will cover some of the most basic problems experienced with what would otherwise be considered a piece of equipment that is in good working order and does not experience engine component failure.
The 5×20 series tractor is known for its starting problems related to its inherently poor fuel system design. Specifically, the 5×20 series tractor does not have a fuel pump, instead it relies on a gravity fed system plus a small suction from the fuel injector pump. The design of the 5×20 Series tractor places the fuel tank approximately level with or below the fuel filter and fuel injector. Because of this AND coupled with the lack of a fuel pump a common complaint is that the fuel system loses its prime. The problem is seen much more when the fuel tank is allowed to fill to half or less and the tractor is left idle for a long period of time. Loss of fuel prime requires the operator to go through the fuel system priming process and may involve two to three minutes of cumulative engine rotation before fuel priming is restored and the engine is started.
Consult your owner’s manual for the fuel system priming process. Note: the injection pump is self-priming, however you must loosen the bleed screw on the injection pump and force any air out of the system by operating the hand pump on top of the fuel filter assembly.
It’s hard to say why 5×20 Series tractors sometimes lose fuel prime. Theoretically this should not happen. However, it does occur and John Deere has recognized this problem by generating a service solution. See John Deere Technical Solution # 54399. This solution involves the installation of an electric fuel pump. The John Deere part number for the fuel pump is KV13829. It costs approximately $ 90.
The 5×20 series fuel system includes the use of a check valve between the fuel tank and the fuel filter. This check valve is intended to provide a one-way flow of fuel from the tank to the filter. Fuel can only pass in one direction and the check valve is there to prevent fuel from flowing in the opposite direction and thus a loss of fuel priming. However, as we know from the above, the 5×20 series can and does lose its prime. Unfortunately, this check valve can become clogged and block the delicate flow of fuel from the tank to the fuel filter. This obstruction can prevent your tractor from starting.
Not only can this check valve become clogged with debris introduced by the operator, it can also become clogged with debris from the fuel tank left over from the manufacturing process. Yes, this means that for some people their check valve is clogging due to poor manufacturing processes at the factory or sloppy workmanship. Specifically, the fuel tank in this series of tractors is made of a polymeric material similar to plastic. When the fuel line holes are drilled in the newly manufactured tank, it is not uncommon for some of these plastic shavings to remain in the tank. Eventually and over time these small chips can end up clogging the check valve in the fuel line. To remedy the problem, the check valve can be removed and compressed air blown through it or, more appropriately, the check valve replaced. JD part # AL117189 is a simple plastic check valve that sells for about $ 12 at your JD dealer.
Additionally, you may find that dirt has also found its way into the manual fuel priming pump located on top of the fuel filter. The priming pump is easily disassembled for cleaning without the need for tools. Simply unscrew the plastic ring around the pump to remove all components and clean them before reassembling. Pay attention to how the parts are assembled during the cleaning process.
If the above issues are not your problem, that is, you do not have a clogged fuel system and you have reset the prime by performing the priming procedure, then the problem could be the fuel cut solenoid. The fuel shutoff solenoid is responsible for shutting off fuel flow to the injection pump when the key is turned to the OFF position. When the key is turned to the ON position, the solenoid “clicks”. It sounds like fuel flow to the injection pump is allowed when the solenoid is activated. If you do not hear a “click” when the key is turned to the “ON” position, the fuel cut solenoid may need to be replaced or electrical current may not flow from the key switch to the solenoid.
You can test the solenoid directly without involving the keyswitch circuit. To do this, make sure the key is in the OFF position. Take a long wire or jumper cable and connect one end to the positive (+) terminal of your tractor’s battery. Connect the other end of the wire to the positive (+) terminal of the fuel shutoff solenoid. You should hear a “click” when the solenoid activates. If this occurs, your fuel cut solenoid is in good working order. If not, you will need to replace the solenoid. If the fuel cut solenoid is OK, the next thing to check is the fuse in the fuse box. Check your owner’s manual for the location of the fuel cut solenoid fuse or find a fuse map on the back of the fuse box cover. If the fuse is blown, replace it. If the fuse is good, then the key switch may be bad.
Hopefully, if you had a problem starting your John Deere 5425 5×20 series tractor, the above three solutions fixed your problem. If not, obviously the problem could be much more complicated or expensive. I’m not going to cover those potential problems here, but the problem may be:
1. Cold weather and glow plug failure.
2. Injector pump failure.
3. Clogged injectors.
Good luck. Hope this post helps someone. If anyone wants to post any follow-up information or useful additional information, please do so. “