From lighting and trailer couplings to engine parts: we have lined up more than 200 parts for the John Deere 4040 from the 40 series on this page.
Need a part for a John Deere 4040? This page lists more than 200 replacement parts that fit it, from GRANIT and from brands such as BOSCH, HELLA, GRAMMER and VICTOR REINZ. The 4040 belongs to the 40 series, and the type plate on your tractor confirms which model you are working on. Many John Deere parts also carry a stamped or cast reference number, which is the quickest way to match the old part with its replacement.
For cooling there are thermostats, radiator hoses and V-belts. When you replace the thermostat, fit a new housing gasket at the same time and squeeze each radiator hose while you are there. A hose that feels soft, swollen or rock hard is due for replacement. Refill the system slowly afterwards and let the engine warm up with the cap off so trapped air can escape.
On the fuel side you will find feed pumps, feed pump seals and lockable tank caps with a vent. For anyone opening up the engine there are piston ring sets, sealing rings, shims for the rocker gear and repair sets. The exhaust is covered by manifold and silencer gaskets.
For the lighting there are headlights and separate lenses, so a cracked lens does not mean replacing the whole lamp. The driver can choose from air suspended tractor seats, and at the rear there are drawbars, including one finished in John Deere green.
If the engine dies after running for a while, or starts badly after a cold night, the feed pump may be drawing air. Check the pump seal and the fuel lines for damp patches, and bleed the system with the hand primer after any work until no more bubbles appear. A tank cap with a blocked vent causes the same symptoms, because the tank pulls a vacuum and the pump can no longer draw diesel. Open the cap when the engine falters and see if that cures it. On a lockable cap the vent should stay clear even when it is locked.
Fitting new piston rings is another job where care pays off. Check the end gap of each ring in its bore, stagger the gaps around the piston and make sure the marking faces up.
The John Deere 1640, John Deere 2040S, John Deere 3640, John Deere 4240 and John Deere 4440 each have a page of their own. If you run more than one of them, check each tractor on its own page before ordering. Every other model of the brand can be reached from the John Deere parts overview.