Removing & replacing Truma rollers.
Please look at Truma & other spares, then Truma standard alloy rollers, for a guide to fit alloy rollers, inc pics.
Standard roller:-
First remove the 2 end cap bolts, then pull off the end cap, the roller should now pull off the gearbox stub, clean the stub & either grease it or use copper slip to lubricate it, put some grease into the roller & push the roller onto the gearbox stub, fit the end cap after cleaning & greasing its stub end, finally tighten up the end cap, there should be a small amount of free play (side to side movement of a couple of mm) if there is more than that a steel washer can be fitted to take up the free play, but I’ve never needed to fit one.
On occasions there has been one or 2 complications, mainly the old roller will not come off the gearbox stub, it should be soaked in release fluid like plus gas, the easiest way is to remove the mover side & then stand it on end with the roller in the air, fluid can be poured through the roller bearing centre hole then left to soak, it usually works in 24 to 48 hrs, If it still won’t budge a blowtorch can be used to heat the roller expanding it, then a few taps with a hammer usually frees it.
When it stubbornly refuses to move my most extreme method is to drill a line of 4, 4mm holes close together, in line with one of the cut out notches, a chisel or even old screwdriver can then be hammered into the holes, splitting the line of holes & expanding the roller, this never fails, it just falls off.
On occasion sometimes the end cap won’t come off easily, caused by rusting together of the bearings inner race with the end caps stub end, a chisel or large screwdriver can be hammered in to separate them, it usually works, or pulls out the bearing, on 1 occasion it broke the bearing, but if you are fitting new rollers the bearings are included so it’s not a problem.
Keith...
Please look at Truma & other spares, then Truma standard alloy rollers, for a guide to fit alloy rollers, inc pics.
Standard roller:-
First remove the 2 end cap bolts, then pull off the end cap, the roller should now pull off the gearbox stub, clean the stub & either grease it or use copper slip to lubricate it, put some grease into the roller & push the roller onto the gearbox stub, fit the end cap after cleaning & greasing its stub end, finally tighten up the end cap, there should be a small amount of free play (side to side movement of a couple of mm) if there is more than that a steel washer can be fitted to take up the free play, but I’ve never needed to fit one.
On occasions there has been one or 2 complications, mainly the old roller will not come off the gearbox stub, it should be soaked in release fluid like plus gas, the easiest way is to remove the mover side & then stand it on end with the roller in the air, fluid can be poured through the roller bearing centre hole then left to soak, it usually works in 24 to 48 hrs, If it still won’t budge a blowtorch can be used to heat the roller expanding it, then a few taps with a hammer usually frees it.
When it stubbornly refuses to move my most extreme method is to drill a line of 4, 4mm holes close together, in line with one of the cut out notches, a chisel or even old screwdriver can then be hammered into the holes, splitting the line of holes & expanding the roller, this never fails, it just falls off.
On occasion sometimes the end cap won’t come off easily, caused by rusting together of the bearings inner race with the end caps stub end, a chisel or large screwdriver can be hammered in to separate them, it usually works, or pulls out the bearing, on 1 occasion it broke the bearing, but if you are fitting new rollers the bearings are included so it’s not a problem.
Keith...