John Deere 1990 Heavy Equipment Parts & Accessories

1990 John Deere Lawn Tractor Aftermarket Parts: Keeping Your Machine in Perfect Condition

For those that take lawn maintenance and tilling seriously, a 1990 John Deere lawn tractor is a versatile option that can make the job easier, especially when seeding and drilling. These tractors are tough, bring a professional level of quality to the table, and have easily replaced 1990 John Deere drill parts and other components. These also tend to see the most use during the warm weather seasons, so before the spring changes to summer, consider purchasing the parts you need before the rush. On the aftermarket, you can purchase any part you need, and you can even find things like manuals and service guides so that you can still have documentation, even if you lost it.

In a tractor, things can get very hot, especially near the engine. The water pump is designed to propel coolant throughout the system, making a circuit and hitting the radiator twice, but this doesn’t dispel all of the heat. A heat shield is designed to keep this heat, which can easily reach temperatures of 900 degrees Fahrenheit, from damaging other engine components. If you notice excessive heat from your tractor's engine bay, then it’s time to replace the heat shield. Remember, each John Deere tractor may have a slightly different heat shield replacement procedure, so refer to the manufacturer’s instructions before making a change.

The SeedVU unit, which stands for seed venting unit, is an attachment used on John Deere tractors. The SeedVU system uses air pressure to propel seeds into tilled lines so that you can quickly plant rows of crops without as much manual effort. If you’ve ever noticed seeds on the ground after seeding, this results from a faulty seeding system. This system vents excess air and has a conical shape so that the seeding system self-cleans, which prevents blockages during the spring and summer months.

Sometimes, there’s a lack of balance on a tractor, and when you’re drilling, there isn’t enough downforce to properly drill into the ground. Ideally, you want your tractor to push easily into the soil, which is why the UniForce hydraulic system for John Deere tractors was created. This augments parts for John Deere 1990 and adds hydraulics to apply extra down pressure. It can be used with these John Deere applicators:

• The 60-series, which includes models 1560 and 1860
• The 90-series, which includes models 1590, 1890, 1890 CCS, 1990 CCS, 1690, and 1895
• Any 750 drills above serial number 3834
• 1850 drills
• 2510H Anhydrous Applicators

Also known as a selective control valve, the SCV of a tractor is used to moderate the pressure in the various high-pressure hydraulic lines of your John Deere. For example, if your tractor has stabilizers installed, then the SCV will control which input the pressure and oil are sent into the stabilizer hydraulics. This effectively decides whether the hydraulics telescopes inwards or outwards, which controls the positioning of the stabilizers.

The CCS in John Deere 1990 CCS stands for Central Commodity Systems. These systems are designed for seed metering and dispersion. They also have a wide variety of working widths and row spacings so that you can set your preferences more easily for different crops. This model also has an electronic population rate control that allows you to change seed populations on the fly. This is done in the cab using Switch A.