Hi All.
I'm new here and to Dumpers, I'm looking for some help with Nimbus 40M gearbox, gears very crunchy and I don't think clutch is fully working, any advice for a novice, pics available
Hi, New Owner Thwaites Nimbus 40M box
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Re: Hi, New Owner Thwaites Nimbus 40M box
Hi and welcome to the site I am guessing that the clutch is either mechanically activated by a rod? If so there should be some adjustment on it? If not then it must be hydraulically activated? If so there may be no adjustment possible which may mean replacing the clutch unless you have a master or slave cylinder fault, is the pedal spongy when you depress the clutch? There are plenty of dumper owners on here who can offer better advice than me.
Jeremy
Jeremy
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Re: Hi, New Owner Thwaites Nimbus 40M box
Jeremy Rowland wrote:Hi and welcome to the site I am guessing that the clutch is either mechanically activated by a rod? If so there should be some adjustment on it? If not then it must be hydraulically activated? If so there may be no adjustment possible which may mean replacing the clutch unless you have a master or slave cylinder fault, is the pedal spongy when you depress the clutch? There are plenty of dumper owners on here who can offer better advice than me.
Jeremy
Hi Jeremy,
The dumper Robin has looks to me like an old Thwaites Nimbus. I haven't worked on one since the 1960s, but from memory, it will have the Thwaites rod operated "brake drum clutch."
The first thing to say is that the Newage box is a crash box with no synchromessh so a clean change on the move is difficult to acheive. Also it's worth checking the oil in the gearbox because water ingress was always a problem!!
If however it's difficult to get the gear to engage when stationary it does point to the clutch. First check out the linkage and clutch release bearing. If all is well adjust the linkage to give approx one and a half to two inches of free movement at the pedal.
To adjust the clutch tighten the square adjuster on the brake/ clutch drum back-plate all the way until tight. Get help to push the pedal to the fully disengaged position and hold it down. Then slack back the adjuster a few flats till the drum is just free to move.
Thwaites drum clutch below.
I hope this helps.
Fred
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Re: Hi, New Owner Thwaites Nimbus 40M box
Hi
I rebuilt a newage 40m gearbox and they are prone to the front bearing wearing out on the layshaft collapsing and causing difficulty in engaging gears, they have been replaced with a bronze bush which is available from L&SPLANT Engineers
Hope this might help if Fred's diagnosis does not prove to be the cause (bearing number 16 in the attached photo)
Ian
I rebuilt a newage 40m gearbox and they are prone to the front bearing wearing out on the layshaft collapsing and causing difficulty in engaging gears, they have been replaced with a bronze bush which is available from L&SPLANT Engineers
Hope this might help if Fred's diagnosis does not prove to be the cause (bearing number 16 in the attached photo)
Ian
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Re: Hi, New Owner Thwaites Nimbus 40M box
I have the same dumper and the clutch has started making a noise when pedal depressed. Would that be a thrust bearing? Quiet when out but noisy when in. Is it easy to replace?
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Re: Hi, New Owner Thwaites Nimbus 40M box
freddyuk wrote:I have the same dumper and the clutch has started making a noise when pedal depressed. Would that be a thrust bearing? Quiet when out but noisy when in. Is it easy to replace?
You can see the thrust bearing and get your hand on it with the Nimbus drum clutch and chain drive set up.
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