sledshedrevy
Active member
in 08 an 09 the failure of the primary components was to say the least staggering. 2010 it completely disappeared based on what we saw and sold to keep guys and gals running when they came to visit here.
main killer was the motor moveing left ,, reason was the front two motor mount holes were a square 13mm hole . this allowed the motor to move .
fix came in 2010 with the square hole being changed to a 8mm round hole . no way the motor can move left .
one failure we saw when looking at the primary clutch was the wear of the lower bushing , just below the primary spring . it can look good but when you have the clutch disassembled , place the moveable sheave back onthe center shaft and pull it 90 degrees to the shaft and see how much play there is at this point .it is not to hard to change this very inexpensive bushing .
to much play allows the sheave to cock side ways enough to slow the up shift and delay the sensivity of the back shift .
also creates a lot of heat .if it has gone to long unchecked it wears the spring tower cap, shows wear on one ramp before the others and usually needs a roller or set replaced .
doo also raised the primary spring end pressure up to 350 to help assist the back shift and allow you to run the clickers on number 3 at elevation .
secondery didnt really have any issues . most of the clutching issues come from the primary.
were the primary tra fails the mountian crowd is in the design . it doesnt retain its arm push when it moves its arms out . the arm arc has the push going correct up to the point that the ramps begin to curl up and the roller now begins to climb the ramp .the outward push of the rollers now begins to lessen .
fine onthe flat as it can over come the greatly reduced effort to close the clutch , but put it under load and it stalls .typically what we call hitting the wall.
cat and polaris primary clutches do not sucum to this as they are designed differently and finish way better in the deep snow loaded condition.
has to do with were the rollers are located and were the mass of weight is located .
no amount of clutch kits will fix the design flaw that the tra has .it reaches that stall point on the ramp and nothing short of a lot less load will alow the roller to climb the ramp.
when we raced the sleds in hill climbs we never used the tra for this very reason.
main killer was the motor moveing left ,, reason was the front two motor mount holes were a square 13mm hole . this allowed the motor to move .
fix came in 2010 with the square hole being changed to a 8mm round hole . no way the motor can move left .
one failure we saw when looking at the primary clutch was the wear of the lower bushing , just below the primary spring . it can look good but when you have the clutch disassembled , place the moveable sheave back onthe center shaft and pull it 90 degrees to the shaft and see how much play there is at this point .it is not to hard to change this very inexpensive bushing .
to much play allows the sheave to cock side ways enough to slow the up shift and delay the sensivity of the back shift .
also creates a lot of heat .if it has gone to long unchecked it wears the spring tower cap, shows wear on one ramp before the others and usually needs a roller or set replaced .
doo also raised the primary spring end pressure up to 350 to help assist the back shift and allow you to run the clickers on number 3 at elevation .
secondery didnt really have any issues . most of the clutching issues come from the primary.
were the primary tra fails the mountian crowd is in the design . it doesnt retain its arm push when it moves its arms out . the arm arc has the push going correct up to the point that the ramps begin to curl up and the roller now begins to climb the ramp .the outward push of the rollers now begins to lessen .
fine onthe flat as it can over come the greatly reduced effort to close the clutch , but put it under load and it stalls .typically what we call hitting the wall.
cat and polaris primary clutches do not sucum to this as they are designed differently and finish way better in the deep snow loaded condition.
has to do with were the rollers are located and were the mass of weight is located .
no amount of clutch kits will fix the design flaw that the tra has .it reaches that stall point on the ramp and nothing short of a lot less load will alow the roller to climb the ramp.
when we raced the sleds in hill climbs we never used the tra for this very reason.
