Tips for Muck Spreader Maintenance
On this page
1. Tips for Bunning and ECE bed drive maintenance.
2. Bed drive gearbox bearings.
3. Bed drive relief valve setting.
4. Tips for fitting Bunning auger gearbox to ECE spreader.
5. Better sealing for ECE auger gearboxes
1. BUNNING / ECE BED DRIVE
The gear box can be difficult to remove but not always, some machines have the shaft diameter reduced in order to facilitate removal. Because of this difficulty we try to do as much of our maintenance as possible without separating gearbox and shaft. Don’t be tempted to apply force to the gearbox casing, it will break. The whole gearbox / shaft assembly can be removed, by removing the bearing housing bolts and sliding the whole lot out through the bearing housing hole. If you are unlucky enough to break the casing we may be able to supply a second hand one.
The easiest way to remove the sprockets is with a burning torch, but be careful these shafts are alloy steel and under considerable stress when working. High temperature can affect the temper of the shaft.
If the shaft is to be replaced just cut it and use a press to remove the stub from the gear box taking care not to put any force on the gearbox casing. We use a 50 ton press and on occasion even that has failed to separate gearbox and shaft in which case remove the hub / sleeve from the gear box with shaft still in it and apply heat while pressing, see photo below.
Another way to remove the gear box is to make a puller from a short piece of suitable size steel pipe, weld a nut, at least m40, in one end with its axis in line with the tube axis, weld the tube and nut to the gearbox hub so that a piece of threaded bar screwed through the nut will bear on the end of the shaft, take a piece of suitable size threaded bar, weld a nut to one end and screw it through the nut welded to the gear box hub. Be careful not to get weld splatter in the gear box. Separating the hub and shaft can require a lot of force, sometimes more than 50 ton, so a substantial nut and screw is essential, even then it doesn't always work, and remember you will need to clean up the gear box hub after cutting off the tube. You could also remove the sprockets by this method but remember there is a grub screw between the flanges of the sprockets.
If the slopey bit on the side of the gearbox is facing in over, like an ECE, it is possible to draw the gearbox off its hub leaving the hub on the shaft. See pic below, this gearbox will remove by this method. You will need to remove the entire gear box and shaft assembly. Then remove the inner seal and cir clip and draw the gear box off its hub. On some other makes of spreader you may be able to get to this cir clip without having to remove the assembly first. The hub can then be removed from the shaft as above but you now have the option of using a little heat but remember the shaft is tempered so too much heat will affect this. Another way to remove the hub is to use a 50 ton, or more, conventional workshop press, but you will need to lift the press in order to allow the shaft to protrude from beneath, see photo, but be careful, I accept no responsibility for any one dropping a press on themselves, or any other kind of accident. You may also need to remove the sprockets to get the shaft into a press. This method can be used for a gear box with slopey bit on the outside but the gear box will need to come over the entire length of the shaft requiring the sprockets removed first. When refitting make sure the gearbox slides on easily, grease the shaft and hub to make the job easier next time.
Whether or not you separate the shaft and box always fit new double lipped seals to the gearbox because muck can squeeze through the bush, through the seal and damage the bearing. While the seals are out check the bearings. These bearings do fail and then cause other damage.
If fitting new sprockets with the gear box on the shaft then grind the rust off the shaft in order to allow the sprockets to slide easily but avoiding the bits where the sprockets fit, use Loctite when refitting. While you're at it, fit a new double lipped seal in the back side of the gear box.
Regularly check all the gearbox oil levels and oil colour and change if discoloured.
2. BED DRIVE GEARBOX BEARINGS.
I can't remember a failure of one of these gearboxes which wasn't initiated by bearing failure. We often replace bearings and seals before failure occures. We are experimenting with different bearings like angular contact and cylindrical rollers but these cost a lot more however we believe the extra cost may be worth it. Please feel free to contact us for more info 01609 773607 or watch this space, I'll provide more info here when I get chance.
The older Bunning and ECE spreaders had only a single relief valve on the bed drive thus extensive damage can be caused if the bed is run the wrong way when the spreader is full. We recommend the fitting of double relief valves especially if you are hiring out.
It is important to set these relief valves correctly. Different sizes of spreader and different sizes of motor may need different pressures. Bunning's recommended pressures for their 2014 Lowlander 120 Mk 4 are 2000 psi for empting and 1000 psi for reverse. These valves can be set prior to fitting by connecting them to a tractor hydraulic output. You will need 2 suitable hydraulic hoses, a T piece, a pressure gauge and a blanking plate.
All items are readily available from us or elsewhere, the blanking plate is easily made, just a flat piece of 8mm or thicker plate with 4 bolt holes drilled in it.
Some models of motor won't accept this relief valve. There are numerous valves available but what we do is put one of the same valves in the line, however the motor side of the valve has no threads in the ports, so a suitable adaptor plate will need to be fabricated. We could do this for you or you could do your own, it is not difficult, see the right hand picture.
We accept no responsibility for any loss or damage caused by following this advice
4. Instructions for fitting Bunning gearbox to ECE spreader.
Don’t assemble the couplings yet. First try the top part of the coupling in the bottom of the rotor. If the teeth in the bottom of the rotor are burred the burs may need to be ground off.
Note: after assembly there will only be limited scope for altering the rotor timing. The rotors are on 8 spline shafts so the minimum alteration of timing is 1/8 of a revolution. If you consider this to be sufficient then skip the next paragraph.
You might prefer to set the timing before welding the couplings in. If so I suggest that you first insert the inner halves of the couplings into the outer halves without the rubbers, insuring correct alignment and timing. You could mark the outside of the two halves in order to assist with the timing then lightly tack weld the two halves together. Place the couplings onto the output shafts of the gear box. Turn the rotors until the required timing is obtained. Please note, when setting the timing consider the auger flighting, ie. position the flighting on one auger approximately, vertically half way between the flights on the other then check the auger teeth (stripers) spacing them as far apart as possible then, most important, the paddles on the bottom of the rotors. We find there is no perfect timing. Raise the gear box assembly into position and re check the timing. Carefully check the alignment of the couplings, if the alignment is not correct the life of several components may be reduced. Check that the outer tube of the coupling is parallel to the rotor and the bolt pattern on the end of the gearbox is aligned with the channel section it bolts too. Weld the top part of the couplings to the rotors, remove the gearbox, grind the tack welds off the couplings and remove the lower part of the couplings.
If you chose to leave the timing until later then skip this paragraph.
If you have skipped the above paragraph then insert the top part of the couplings into the rotors, carefully check alignment and weld into place.
Note: the rubbers have some of the corners chamfered in order clear the welds on the blades of the two parts of the coupling. These couplings aren’t desperately tight fitting so you shouldn’t have a problem squeezing them together however you might chose to provide a slight chamfer on the ends of the blades and / or use washing up liquid to ease the rubbers in, do not use mineral oil. Position the lower part of the couplings, complete with rubbers beneath the upper part and squeeze fully into place with a jack. Bear in mind the rotors aren’t vertical so the jack will need to be tilted also the spreader prevented from rolling. Note: the bearings on the tops of the rotors are housed in cast iron so can’t take a lot of force. Grease the splines of the couplings and gearbox. Manoeuvre the gearbox into position and engage the splines, check the timing, then raise the gearbox until it has lifted the rotors about 5mm off the deck, check the couplings and splines are fully engaged, check that the bolt holes in the end of the gearbox are aligned and central with the channel sections on the back of the spreader ie. the two front and back holes are parallel with the edges of the channel, check that the ends of the gearbox are the same height relative to the spreader, check that the rotors turn freely and are not catching anywhere, then mark and drill the holes. You may need to remove the gearbox to drill the holes then bolt the gearbox in place. You will find that the gearbox overhangs the bottom of the spreader so take a suitable size piece of flat bar or plate, longer than the diameter of the gearbox so that you can get some weld on the inside, drill two holes in it, bolt it to the end of the gearbox and weld it to the spreader. Don’t burn the rubber seal in the end of the gearbox.
You will need to change the yoke on the input shaft. This yoke is not provided in the kit because not all spreaders use the same UJs. Your local Agricultural Engineer should be able to supply anything not in the kit or if you identify the UJ you could order the yoke from us, not included in price of kit.
Use this info at your discretion.
I accept no responsibility for any problems you may incur by using any of the above info.
5. Better sealing available for ECE muck spreader auger gear boxes.
There is a tendency for muck to fall through the hole in the auger deck and thence through the seal and into the gear box, see the photos below. There is now a seal available which attaches to the bottom of the auger drive dog which is a big improvement but still not perfect. The later dogs have a shoulder on the bottom for the seal to attach to. It's not difficult to reproduce this shoulder if you have a lathe, just weld a suitable size washer to the bottom of the dog and then turn to size. We can advise 01609 773607. With or without these seals it is very important to check the gear box oil level and colour frequently and top up or change as required. Make sure these dogs are well greased during assembly and have a good o ring in place, the o ring can be seen in the first pic.
Just to prove what I'm saying about ingress of muck, see first photo. The second photo shows a new type dog on a gear box with seal fitted. Next is a new type dog with seal fitted and an old type dog. Next is a new type showing the shoulder and the last picture is, left to right, new type, new type with seal and old type. We are constantly working on improving ours and customers equipment. If you would like any further advice please ring 01609 773607 and ask for John Parlour.
We accept no responsibility for any problems you may incur by following this advice.
See right, another way to help reduce the muck entering the gearboxes. This also greatly increases the strength of the paddles. It is a 10mm thick steel disc welded to the bottom of the auger although 8mm should be adequate. Cut the disc in half in order to facilitate fitting and weld back together while welding it to the auger. This one has a ring made from 8mm round bar welded to the underside of the perifary of the disc and another smaller one welded to the auger deck under the disc. You will need to burn off the original very small disc and maybe a bit off the bottom of the paddle brackets. Note: this isn't a substitute for the seals shown above. Take this info at your own discretion, I accept no responsibility for any loss or damage you might incur by following this advice.