Hi I have a mtd rh135/105b 42inch ride on mower and the belt has snaped on the cutting deck . I need a diagram so I can put the replacement one on.
Hope someone cun help
Thanks andy

Hi! ajfdavidson, welcome to AMHD :)

Here's two, the first is for models made, starting in 2003:
MTD RH 135/105 B / 13BA508N600 (2003) Mower deck N, 500 series since 2003 Spare Parts - Powertool Spares

This one is for models made in 2004:
MTD RH 135/105 B / 13BA508N600 (2004) Mower deck N Spare Parts - Powertool Spares
Here's another look on the '04 page, there's a diagram at the bottom:
MTD RH 135/105 B / 13BA508N600 (2004) Kit idler arm belt mower deck N Spare Parts - Powertool Spares

On all three pages, use the "+" sign to magnify, then drag viewer to area, for a better look.

Installation look's the same for both, although the '04 does state the belt has a designed twist in two places.

There is also a difference in the belts:
MTD RH 135/105 B / 13BA508N600 (2003) Mower deck N, 500 series since 2003
'03 = BELT:V TYPE:5L X 106 LG KEVL

MTD RH 135/105 B / 13BA508N600 (2004) Mower deck N
'04 = BELT:V TYP:HB x 105 LG

If you already have the belt double check it at your supplier before you put it on, that 1 centimeter from 105 to 106 will make a big difference.
There should be a better way of telling the difference's between the model years, look for more #'s.
There are subtle differences, like the seats.

Best of luck
k

Hi,
I find nothing wrong with the above answer, but would point out the belt on both decks has the same two twists to align the features of the belt with the features of the sheaves.
I do not find the belts cross-reference to each other, but would point out that other features of design such as "V" versus a wedge design could account for that.
Most belts will have their part number burned into the outer edge.
Peace,
Clarke

Thanks, Clarke

Thanks for the information much apricated andy

Your welcome... k