990 Front axle

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buzzybee
Posts: 4
Joined: Sat Mar 05, 2011 10:24 pm

990 Front axle

Post by buzzybee » Sat Mar 05, 2011 10:35 pm

Hi all, new to this forum and from the other end of the world in New Zealand. Just got given a 990 selectamatic, live drive power steer. Previous owner has done new clutch and engine, so it runs really well. however it got run down a hill and the front axle is bent, the left side is about 2 inches behind the right hence it has a full lock one way, but the ram cant close and turns about 10 percent theother way. I was told there is a single pin to take out to drop the axle off to straight it in a press? any ideas on this? also behind the sump there seems to be a cover missing under neath? parts are hard to come by over here, so repairing is more of an option.i know its been flogged on here already, but using the same engine oil in the engine and the hydraulics/gear box is fine right? any help appreciated. regards luke

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RE: 990 Front axle

Post by Guest » Sun Mar 06, 2011 12:42 am

Hi Luke and welcome.

The part youare explaining is the 'trunnion pin'. It slides in from behind the front casting, through the tube in the centre of the axle which has 'web bands' front and back to strenghten it, these should be straight. The trunnion pin has to be pulled out from behind and you have to drain the engine oil and remove the sump pan to get the trunnion out. The trunnion is held in place by a long bolt up through its tube in the front and in the top there is a splined threaded collar that this bolt goes through, a 'special' nut. This collar can be difficult to remove but you have to be able to tilt the axle to its fullest angle downward and once you drift out the collar with a suitable sized pin punch it should, witha bit of fiddling, come out. In the rear of the trunnion pin you will see that there is a threaded hole for a bolt, a puller is required for this. If the trunnion pin is badly bent then it may not want to be removed, depends where it is bent, between the rear of the tube and the hole in the casting there is also a 'thrust' washer. The easiest way out is to fit a complete front casting and axle from a donor 990 but in doing this the tractors serial number is stamped in on the top flat face of the casting, right hand side just behind the radiator and you end up with the number of the donor so keep the original number for reference, identity issue, like 'ringing' a motor vehicle. If the webs on the axle tube are bent or distorted at all you will not be able to straighten the axle.
The missing cover I assume is under the tractor below the clutch bell housing, look up into it and you'll see the clutch unit. Tis cover is an oval shape with a 'scoop' in the middle, basically to stop any vegitation debris from being drawn in and wrapping around the clutch unit and a drain point as well, if you can find a scrap white/brown/orange D.B. with one on they it will fit yours. Have a look see as to what's bent on the axle, best assesed with the axle removed as it's not always easy to see with it in place as everything else looks out. Hope this helps. Where abouts are you in NZ?, I know some people in the North Island around the Ngatea, Hauraki Plains area.

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990nz
Posts: 14
Joined: Fri Nov 21, 2014 6:07 am
Location: New Zealand

RE: 990 Front axle

Post by 990nz » Sat Aug 29, 2015 5:25 am

Hi Powerrabbit . Lost my log in an profile so had to create a new one. Was Buzzybee. The repairs halted for a little while with an addition to the family but back into it now, replacement front axle and pin already to go in, new fibre glass guards and just waiting for a new fibre glass bonnet to come up again as I missed out on the last one.

Found a few places around Nz with a reasonably good supply of second hand or new parts which has helped with a few things. Its already had an engine transplant so the serial number on the original casting is probably pointless now, is there any other way of telling what sort of engine it has in there now? Im just looking at replacing the manifold and exhaust and Agpares NZ has two sizes. It has a few numbers on the left hand side of the engine if they have any relevance? Oh and Im in Auckland which is probably hour or two north of Ngatea hauraki plains way.

Regards
Luke

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RE: 990 Front axle

Post by Guest » Sat Aug 29, 2015 9:11 am

Congrats on your family edition Luke. Look on the right hand side of the engine for the number and type, just below the dynamo/alternator on the side of the block, if it's the earlier wet liner one it will start with AD4/47 with the oil filler and dipstick in the chassis on the right sort of below the fuel lift pump and glass bowl. if it is AD4/49 it will be the later bored block (no liners) and the oil filler will be a twist cap on the timing gear case forward of the fuel injection pump. Going back to the manifold there being two 'types' of engine is why you've been told there's two sizes, you'll have to ask for the one that fits the type of engine you have. The original serial number on the casting won't be pointless now, it still gives the true identity of the tractor and can be manufacture dated by it, the engine number won't matter so much as they were random anyway and engines in tractors have been changed over the years with a replacement if the original was considered beyond repair or the block blown through frost damage.

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990nz
Posts: 14
Joined: Fri Nov 21, 2014 6:07 am
Location: New Zealand

RE: 990 Front axle

Post by 990nz » Sun Aug 30, 2015 4:31 am

Thanks for that . It must be an AD4/49 Dipstick is in the chassis below the dual diesel filters sort of , twist cap oil filler forward of injector pump, but I didnt find a number.. the only thing i found by alternator and power steering pump was K946800F .

Guest

RE: 990 Front axle

Post by Guest » Sun Aug 30, 2015 9:11 am

The K number is a part number, there should be a raised flat strip on the side of the engine block and should be between alternator and steering pump, you're right in saying it's an AD/49 engine. If you can't find the engine number it may be that the block was a factory replacement some time in the tractors former life, new blocks did not have any number stamped on them.

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