Shear Bolts
Shear bolts are built to break under shock loads on the fan or auger. However under
certain circumstances this security is not adequate. Example: a sudden high impact shock on the
fan may, in some cases break the fan shaft without breaking the shear bolt.
If the shear bolt breaks, make sure to always replace it with the same grade of category
bolt (grade 5 for PTO series
20-40-50-60
, and grade 8 for PTO series
80
) it is necessary to
always maintain this bolt very tight in order to keep the efficiency of the shearing mechanism.
Warning:
The gearbox shafts are made with special alloy steel. However they are
case hardened to increase capacity to shock load. These shafts cannot be broken
under normal loads. However undesirable objects may enter the fan and either bend
or break the gearbox shaft. It is understood that the gearbox cannot be built to
resist every possable overload and consequently, gearbox fan shafts will not be
replaced under warranty. Therefore the user of the snowblower must be very
careful.
Maximum length of PTO shaft
Warning:
Telescopic tubes of PTO should overlap a minimum length to meet ideal
conditions for transmitting power.
Following table could be used as a guide to find maximum permissible length of PTO.
PTO Description
Over-all length
Closed
Over-all length
Opened Max
Telescopic tube
overlap
T20-056P
29 3/4"
41"
5"
T40-056P
30 1/2"
40 1/2"
6"
T50-071P
36 1/2"
51 1/4"
7"
T60-071P
37 3/4"
511/4"
7"
T80-066P
36"
47 1/4"
7"
T80-076P
40 1/2"
53"
8"
T90-071P
39"
51"
8"
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