Fiat Tractor Restoration: 1987 Fiatagri 90-90

In January 2020 I decided with much pushing from my eldest son Harry that we should buy our own 2wd Fiat tractor to help with soil preparation, sowing and harvesting of turnips (swedes).

We previously used Ferguson TE20’s or MF35x’s owned by Harrys grandad. We decided if we were buying our own tractor we wanted something that would be big enough to pull more than a two furrow plough, power a medium sized rotovator and had a cab for the wet and cold weather, which we have plenty of.

The tractor still needed to be small enough to hook to a single row turnip harvester and maneuverable enough for drill work.

Fiat tractors

I had a lot experience of using Fiat tractors in the past and they always proved to be reliable although basic tractors. Basic is sometimes good when it comes to repairs and servicing.

We bought an 1987 Fiatagri 90-90 2wd with a supercomfort cab. This pleased me and Harry a lot – it had just over 5000 hours on the clock and was a true rust bucket.

I knew the majority of Fiat tractors have rust issues so I was not phased – I have many years experience with welding so i would put it to use.

Our Fiat tractor in rusty condition
The rust bucket Fiat 90-90 tractor pictured the day i bought it.

The purchase of my first Fiat tractor

The day i went to look at the tractor it was pouring with rain, as you can see from the photo above. It was a 1 1/2 hour drive to get there and i knew the tractor would be rough and probably have hidden faults.

The majority of the tractors for sale were cheap, probably bought at online auctions and then sold on immediately for export to foreign countries.

Everything was sold as seen with no warranty, there were lots of tractors and the one i looked at online was down the back of the yard blocked in by tractors on all sides.

I got out of the car with my coat on and noticed there was no one else in the yard. They were all inside the shed as the rain was pounding down. At least I’ll get peace to get a good look without someone looking down the back of my neck i thought. As i approached the tractor i remember thinking, wow this thing is rough.

New levels of neglect

The cab door had been left open, i climbed in and went to sit on the seat – it was soaking wet. As my eyes lifted from the dirty wet seat i noticed there was moss growing inside the cab along the back window and on the floor. Further up, the roof was leaking badly as the headlining was soaked with water.

This was taking rough tractors to a whole new level.

moss growing inside the cab of tractor
Moss was growing inside the Fiat tractor cab.

I got out to look around the outside of the tractor and could soon feel the rain coming through my coat and jumper before i had a really good close look at everything.

I ran to the car, sat on the seat feeling the rain cold on my back. Forget it, go home – this thing is a bundle of dung i told myself. Then I thought, are you going to buy this and get it done and over with, or are you going to wait around hoping for a better one? Forget waiting – just do it now.

Further inspections

I changed from my now soaked through half decent coat, into a “dirty dog” coat, that i didn’t own. I found it hanging up somewhere and it nearly fitted except the arms were about a foot too short, it had no zipper, just three pop buttons held it together in the middle. But it was dry, investigation part two.

I walked hurriedly back to the tractor and began to assess what id need to do – the list was mostly cosmetic. The engine started easily- 5 cylinders of sweet fiat soundtrack, lift worked- albeit slowly, brakes and all gears worked – do all right.

I drove up to the office and secured the tractor and asked for a few things to be changed. The hateful silver exhaust for the original brown one. Fit the original front roof cover in place of the rectangular tin box. Change the battered side panel to a straight one no matter how rusty it was. And deliver it with it’s own drawbar and pickup hitch hook- Job done!

Delivery of the Fiat tractor

On the morning the Fiat tractor was being delivered, the dealer phoned me. He said he could change the battered side engine panel for a good one, but it was not freshly painted. This was no big deal as freshly painted probably referred to a slap dash of terracotta with a 4″ masonry brush.

The best news was, he could give me two good straight side panels but they had old paint (big deal – the more original the better) but the two side panels did have the original 90-90 badges and the original Fiat badges!. I was happy – the panels on the tractor the day i viewed it were nasty and had no original plastic badges – just a flat cheap sticker – this was great news.

The lorry man phoned me before he arrived and we took the tractor off in pouring rain. i thought it would have a flat battery but it did start (that’s how low my expectations were).

I drove it off the lorry and was keen to leave- the lorry man was laid back and was on for a chat but i was dying to start stripping and rebuilding the biggest heap of dung in Ireland. I tried not to appear rude but left quickly – i also didn’t really want anyone to see what i had bought – she was a dog.

Driving to the workshop

As I drove the Fiat tractor over the road to my workshop i quickly realised a few things. I really liked driving it – the wide cab, the sound and the nice location and shift of the gear change. But i noticed that it was slow – like are you serious slow- i hadn’t drove a 30k tractor on the the road for a long time and it felt really slow- i noted this and continued driving.

The next thing i noticed was that the tractor had a rubbing noise coming from beneath the seat – i listened and felt the sound – it was like a worn wheel bearing but nearly too much like a rubbing noise. the tractor had 16.9 x 34 wheels with weighted centers which can come loose so maybe it was that – i noted it and continued my journey.

There is a steep hill on the way to my workshop and this was when i noticed the next thing. I had eased off on the throttle when i became aware of the rubbing noise – i had to use the foot throttle because the hand throttle was seized stiff- even when i hit it with a block hammer it would not budge. Anyway i floored the throttle at the bottom of the steep hill and the tractor reved up to about 1800 rpm – a few hundred rpm short of what it should have. This could just be throttle cable adjustment. When i hit the steep hill the tractor didn’t even notice – it just continued on as if the hill wasn’t there- Fiatpower.com – great!.

The start of the stripdown

Fiat tractor arrives home
How the tractor looked when it arrived

After i parked the tractor in the workshop i noticed that the left foot brake was juddering – perhaps the brake disc is worn i thought- i noted this and began to strip the full interior out of the cab and place in a safe place along with the windows and doors which i also removed.

the tractor in the workshop
Stripping back to metal

I then removed the side panels, bonnet, front cowl and air breather, front grill, battery, exhaust, (i closed over the holes in the air intake manifold and the exhaust manifold) lights and mudguards. I then began to go around the cab and mudguards with a light hammer tapping every square inch to locate and remove any body filler from the tin work. Then i went over all the bad areas with a heavy wire brush on a 4 1/2 grinder.

Welding work

When i had all the bodyfiller removed i then knew what i needed to replace, which was quite a lot. I began on the cab as it was the biggest job. I made a hoist on the shed rafters and removed the cab from the body platform and mudguards and began work.

rusty cab
Usual rotten areas at the back of the cab – note the folded tin on top of the original mudguard.

I cut out all the rusty tin back to good metal and began patching with new tin. I treated all the internal pieces of the cab metal structure with rust inhibitor and painted it with a grey galvanising metal paint.

tractor cab with metal removed
Cab interior metal treated with rust inhibitor

When i finished the cab metal work i filled any imperfections with chemical metal. I rubbed it down and painted it with two coats of 2 pack undercoat and 3 coats of New Holland terracotta top coat. It looked great.

tractor cab with new metal welded in
Full new mudguard made in heavier metal than standard.
newly painted fiat tractor cab
Newly painted cab

The next part i tackled was the platform and mudguards. I cut away all the rusty panels and formed and welded in the new pieces. Before i painted this part i lifted it up off the chassis of the tractor to take a look underneath.

back end of tractor with rusty mudguards
Rotten mess of mudguards before being fully remade in new metal.
newly painted mudguards
Better now! – Many hours later.

The chassis

When i lifted the platform off it was to allow me to get a good look underneath and to investigate the brake discs contained within the two axle housings. Around this time i was deliberating whether to prolong the refurbishment of the tractor by upgrading the tractor from 30km/hr to 40km/hr. i had been told by a Fiat tractor mechanic that it involved changing the crown wheel and pinion shaft within the back end of the tractor.

newly painted cab fiat tractor
New Holland mat and repainted steering column.

This was quite a bit of extra learning, time and money for me to do, but in the end i decided to do it as I knew once i would have the tractor rebuilt i would most probably not want to strip it down this far again.

Dismantling the back end

I took off the rear lift arms, the pick up hitch, the hydraulic lift cover, then the PTO housing and then the two half axle housings. This was relatively straightforward although time consuming. When i removed the half axles i noticed the brake discs were not too badly worn but they were non genuine. I replaced them with new original ones. I also replaced the outer half axle oil seals and wiper seals.

dismantled fiat tractor back end
Dismantled back end – ready to remove at the gearbox.

The differential

After removing the PTO housing i could look straight into the back end of the tractor, where i could see the crown wheel which has the differential bolted to it. I noticed there was something odd about it – the pin which held the gears inside the differential was half hanging out and the ends of it were burred where it rubbed against the pto shaft above it.

inside fiat tractor back end showing worn differential
Old worn differential – common to Fiats low in back end oil.

This explained the rubbing noise i heard driving it up to the workshop – and how hard the tractor was to push when it was out of gear. I was so glad to have decided to put in the 40k crown wheel and pinion shaft otherwise i may have bolted the tractor all together and then discovered the differential needed replacing – how annoying would that be!

Changing the crown wheel and pinion

I had a chat with a local tractor mechanic who has worked on Fiat tractors for 30 years and he agreed to fit the crown wheel and pinion shaft – there are shims to be fitted on either side of the differential and for what it was going to cost me i easily decided that the Fiat tractor mechanic would do it.

new differential on fiat tractor
New crown wheel and differential

New engine crankshaft oil seal

I noticed when the tractor was sitting in the workshop that it had an oil leak – I had suspicions that it was engine oil coming from the rear crankshaft. I replaced it as it only cost £40 and it successfully stopped the oil leak.

dismantled fiat tractor back end
Bell housing removed to access the clutch, then flywheel, giving access to crankshaft oil seal.

Bolting it all together again

When i got the back end back from the mechanic with the new 40K crown wheel and pinion i then began to bolt it all together again.

new cab interior on fiat tractor
Starting to fit the new cab interior lining

This took a long time but it was worth it when i got to drive it down the road – the new brakes were sharp, the new lift pump gave fast hydraulics at tickover and the 40K box was great on the road – the whole tractor feels new and tight. Harry and I are so happy it is in good working condition now.

finished restored Fiat tractor
Just out of the workshop with narrow rear row crop wheels and tyres for turnip drills.
1987 Fiatagri 90-90 2wd tractor
Pictured on farm with standard rear tyres.

I hope this article is useful to you in some way – I have many more images if you need anything just send me an email. How do you think it has turned out?

We will be happy to hear your thoughts

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