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740, 840 & 840G Snowblowers
3
OPERATING INSTRUCTIONS
1. Do not operate the blower in the fully raised position. The three-point
hitch on some tractors raises high enough to cause the PTO shaft to bind.
This can cause damage to the PTO shaft and/or to the hitch and pins.
NOTE: PTO shaft angle should not exceed 20 degrees for
optimum performance and life. Damage may occur to PTO and/or
Snowblower if angle becomes more extreme.
2. Depth of cut can be partially controlled by tilting the blower forward or
backward. Adjust the top link of the tractor hitch so the snowblower is just
slightly tilted back when resting on the ground. Caution: Excessive
backward tilt may cause the "U” joints to flutter resulting in PTO shear bolt
failure.
3. Adjust the lower link sway chains or blocks on the tractor to restrict side
movement of the blower when operating.
4. Run the blower at low rpm to check operation before blowing snow.
5. The snowblower has two shear bolts to protect the tractor and blower in
case a large object enters the blower. PTO shear bolt (Two 5/16" x
1"-Grade 5) Auger shear bolt (1/4" x 1"-Grade 5). Shear bolts should be
fastened with a lock nut or two jam nuts. These bolts must be kept tight to
prevent wear of the bolt and bolt holes.
6. Never run PTO shaft at over 600 rpm.
7. Chain tension: Slack on the lower side of the chain should be 3/8 to 1/2
inch.
8.
Lubrication:
a) The spout clamps and rings should be periodically lubricated with
gun grease.
b) PTO shaft universal joints and square shaft slide should be greased
daily.
c) Regularly oiling the chain will significantly increase the life of the
chain.
d) The grease fitting on the hydraulic spout swivel arm should be kept
lubricated.
e) For #740 & #840 only: Gearbox is open type and need not be
greased or lubricated.
For #840G only: See Section on refilling for correct oil level. Use
any 80-90 gear oil or multigrade with 80 minimum.