[jwilkes]

I hope that the link worked in the end. Finally started using my machine after a full restore over the winter and many problems with the clutch. Best of luck Jeremy

[jwilkes]

After stripping the engine off to get the new mounting plate painted I managed to break the drive teeth off the old clutch plate. New plate arrived today and is process of fitting. Thought I should mention “Industrial friction materials” in Cardiff. Although took several weeks they took the flywheel, cleaned and painted the unit then cut the new plate to match the flywheel. Not necessarily the cheapest solution but I can say that the quality of the service and attention to detail really could not ne faulted.

Anyone needing new friction plates – they can also make the metal plates in a multiplate system could do worse than contact this supplier

Attachments:

1. 
2. 
3. 
4. 

[jwilkes]

Hi

sorry just assembled the rotor box on mine. The pitch of the join would be the same as the pitch of the links, if you have a Vernier this should give the measurement. The Yeoman is definitely an imperial size.

Jeremy

[jwilkes]

I have had problems last year with worn dogs on a T1200. The pto pulley just lifts off`, bit of a fiddle to get out to repair afterwards. If the plate is free then gentle easing with heavy bars and hammer

Jeremy

[jwilkes]

I think Alan has a good point. I like to review updates occasionally and share some information when I have data that I could not find on an internet search. Perhaps at some time in the future all of the questions will have already been asked. The forum data as an online archive is valuable in itself.

[jwilkes]

Supplementary pictures

Attachments:

1. 
2. 
3. 

[jwilkes]

Sorry for the delay rain stopped so have been preparing the veg plot for the spring planting I have had a problem with the clutch nut slipping after stripping the engine off so I could paint the new Engine mounting plate, probably a mistake with hindsight but we all make those. The rotabox is partially reassembled but an on-gong project as I still do not have the tynes needed but that can wait until the tractor unit is running correctly.

I did manage 3 furrows with the plough fitted off a Honda unit before clutch problems stopped play. I was able to get the soil brown side up with a Ferguson T20 – David Brown 2 furrow plough combination in the end. Not pretty but with the frost forecast this important task is completed.

I finally got some pictures of the tractor hooked up to the plough and riding seat / trailer combination. Purists will note that the Howard Orange is changed to house colours of Grey and Green. Perhaps at a later time a new paint job might be called for, at this time I am happy to think that the metal is protected from the elements stopping the rust.

Attachments:

1. 
2. 
3. 
4. 
5. 

[jwilkes]

Thought an update would be useful to record

Clutch nut is 9/16 BSF thread having damaged the threads I am in process of repairing with Helicoils.

I found that with the dog clutch removed a 17mm rounded but socket can be used to lock the PTO shaft.

[jwilkes]

As promised a drawing of part 16135 – Friction disc uploaded in case this might be useful to others at a future time.

The Dog clutch I snow being repaired by brazing a new layer of material onto the sealing surface ready for turning. I left to cool yesterday rather than re-hardening so will heat and quench in oil later in the week, a good excuse to change the engine oil on the different mowers

Attachments:

1. jrw-26.pdf

[jwilkes]

Managed to strip out the rotor of my Gem to compare with the Yeoman rotor.

The gearchain cover gasket is different so will have to cut a new one from cork which luckily I have some cork available

The tines are the same the Gem so new ones can bought (the old ones were very worn)

The rotor friction plates are of a different to the Gem, I will try to generate a drawing for reference in case anyone else needs one at a later date and suggest alternatives luckily there is some life left in the current ones.

[jwilkes]

I managed to get the dog off the gear with the help of the oxy acetelane torch. There is bad pitting on the dog which I will try to repair with metal filler and then turn and polish again. I was trying to avoid the heat and associated annealing but could not find any other method in the end. Apart from the pitting on the sealing surface looks in good condition.

[jwilkes]

Alan

Thank you for the encouragement. I will probably wait until the sun shines for photos.

Got the new seals and bearings. just need to find a safe method of unscrewing the dog so I can change the oil seal then the basic mechanism can go back together after paint. The rotor box has had a very hard life looking at the tines and the bearings were gone as it looks like no oil in the chain case for a long time. The dog itself is in good condition but I suspect has been impacted on when hitting stones. Tried some big stilsons with a Mole grip on the gear but no luck so far. I think I may need to revert to the blowtorch but worried about too much annealing on the hardened parts. I have heard of these needing changing regularly, anyone with experience got some advice?

[jwilkes]

Bit more progress

The gearbox and engine are working well with the riding seat as a towing unit at the moment. The wheels off the Howard 400 fit well. I am looking for wheel weights as traction I snot a good as it should be. Does anyone know if Howard supplied wheel weights for the Howard 400?

On a different note I woke this morning to snow so lit the wood burner in the workshop and now have the rotor box in bits. Most of the bearings are well shot so just spent £65 and ordered the set I need. Last bit to come apart is the dog drive. Coat of paint and then assembly. A bit of damage to the tin work so an evening welding ahead. Rotor drive friction plate is ok but may source a replacement, looks like the Gem rotor drive might fit, will strip the Gem out to check. will be needing 4 new tines, possibly0 8 so will check the Gem ones when I get everything apart. Will confirm findings in case anyone else tries this task

[jwilkes]

With all the rain I am having some problems with traction, I have fitted Knobly tyres 12-3.00 as I could not find chevron tyres, Looking through the workshop found a pair of rims of what I suspect is a Howard 400. Also have a JAP engine and fuel tank. I already noticed that the engine mount to gearbox is the same as on the Yeoman rims seem to be the same bolt positions and the size is 12-4.00 for which I have a spare pair of tyres so will be fitting these to see if they can be used with the Yeoman gearbox. Might be tight with the Roto box installed

[jwilkes]

Progress update.
I have the engine connected and running. New adaptor plate is in place to connect the riding seat and plough. Minor adjustments to the clutch and gear selectors now needed. The unit is useable at last, next job will be a nut and bolt strip and rebuild of the rotobox which is rather tight. new bearings and oil seals is my hope with new centre tines

[Author]

Posts