Your Tractor Has Been Sitting for Months. Here's What to Check Before Starting It. Usually it is the battery, the fuel or a mouse. Check those before you crank it for a full minute and make things worse

Disclosure. We run a service department and a parts counter, so a tractor that will not start is, strictly speaking, good for business. We would still rather you fix the easy stuff yourself and bring us the hard stuff.

Short answer: Before starting a tractor that has sat for months, look for rodent nests and chewed wires, charge the battery, drain water from the fuel separator, and check engine oil, coolant, hydraulic fluid and tire pressure. If it still won't start, check the safety switches (seat, PTO off, transmission in neutral) before assuming anything is broken.

Tractors do not wear out from sitting. They get ambushed by it.

It usually goes like this. Heavy use in spring, then it sat through summer under a tarp. First rain, washed-out driveway, and the tractor clicks once and goes quiet. That is when people start cranking, jumping and spraying things into the intake. Slow down. Twenty minutes of checking beats a week waiting on a starter.

Most Kubota tractors are diesel, so this is written mostly for diesel. None of it replaces your operator's manual, which has a storage section most people have never opened.

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What Months of Sitting Actually Does

A tractor parked for a few months is not ruined. It just goes off, like milk, in a few predictable places.

The battery drains on its own

Batteries self-discharge with nothing connected, and heat speeds it up. A hot shed in Riverside County or inland San Diego County in August is about as hard on a battery as it gets.

Fuel picks up water and gets old

A partly empty diesel tank breathes moist air as temperatures swing. Water condenses, settles and gives microbes a place to grow. Ethanol gasoline goes stale in months unless stabilized.

Animals move in

Mice and packrats nest in quiet engine bays and chew wiring. Wasps build in vents. This is the one that turns a ten minute start into a repair bill.

Rubber and tires settle

Tires lose pressure. Sun and dry Santa Ana air crack sidewalls and hoses. It adds up.

Walk Around It Before You Touch the Key

Key in your pocket, not the ignition. Bring a flashlight, gloves and a dust mask.

Look for nests and chewed wires

Look for leaks and loose things

Fluids, Grease and Filters

Park it level and check everything cold. That is the honest reading.

Engine oil

Dark is normal. Milky or foamy can mean water or coolant got in; do not start it until someone looks. If the change is overdue by hours or by time, do it now. Oil ages even when the engine does not run.

Coolant

Check the reservoir cold. Never open a radiator cap on a warm engine. Clean the radiator screen too; SoCal dust and seed heads pack into it, and that is how tractors overheat.

Hydraulic and transmission fluid

On many Kubota tractors the transmission and hydraulics share one fluid, checked at the rear. Milky fluid points to water. Kubota specifies its own fluid for many models. Our guide to Kubota hydraulic fluid explains what goes in and why.

Grease points

Pump fresh grease into every grease fitting (the small nipples, called zerks, at pivot points) on the loader, front axle and 3-point hitch. Fifteen minutes. Cheapest maintenance on the machine.

Air filter

Chewed, torn or nested means a new filter. Dirt past the filter goes straight into the engine.

Intervals and filter lists are in our Kubota maintenance basics guide. If you are not sure which filters fit your machine, the Kubota serial number lookup guide shows where to find the numbers the parts counter needs.

The First Start, Done Gently

Battery charged, PTO off, neutral, parking brake set, ROPS (the rollover bar) up, you in the seat, belt on.

Let the glow plugs do their job

Diesels use glow plugs or an intake heater to start cold. Wait out the preheat light before cranking. Skipping it is how people decide a good tractor is broken.

Crank in short bursts

A few seconds, then rest. Long cranking cooks the starter and drains the battery you just charged. The manual gives the limit.

Idle, watch, listen

Low idle. Watch the warning lights go out and listen for knocks. Smoke that does not clear means shut it down and ask.

Work the hydraulics and brakes before the job

Cycle the loader and 3-point empty, test the brakes, look for leaks. On a newer tractor with a diesel particulate filter, skip the hour of idling. Our DPF regeneration guide covers why.

If you are starting it for storm cleanup and the ground is still saturated, wait. Our guide on whether a compact tractor can handle a muddy property explains what wet clay does, and the after-the-rain cleanup guide has the order to work in. Nobody runs a tractor in moving water, on a soaked slope or during a storm warning.

When to Stop and Bring It In

Here is where we would stop, too, if it were our tractor.

If you want to do the work yourself, the PDQ parts counter can pull filters, fluids and belts by model and serial number. Have both ready.

If the job cannot wait for the repair

If the tractor is in the shop the week the driveway washes out, rent. PDQ rents skid steers, track loaders, garden tractors and dump trucks through the PDQ rentals site, or hire a contractor for a one-time job. PDQ's posted rental policies say a valid California driver's license is required for all rentals and deposits vary by item; the signed rental contract is what governs. For anything else, ask, and see the rental policies page.

How to Store It So This Does Not Happen Again

In much of LA County, Riverside County and San Diego County, the off season is summer: the hottest, driest months, rough on batteries, rubber and fuel. A little prep before you park it fixes most of this guide.

Thinking about buying a first tractor? Our guide on what first-time tractor buyers overlook is honest about storage and service. If the problem is a PTO driveline, see why PTO shafts fail.

Straight Answers