Buhler FK740, FK840, FK840G User Manual

740, 840 & 840G Snowblowers

TABLE OF CONTENTS

DESCRIPTION PAGE

Warranty......................................................................1

Safety Instructions & Safety Sign Locations ................2

Operating Instructions..................................................3

Assembly Instructions..................................................5

Refilling #840G Gearbox..............................................8

Snowblower Drawings .................................................9

Snowblower Parts List .................................................13

840G Gearbox Drawing & Parts List............................16

Snowblower PTO Drawing...........................................17

PTO Parts Lists............................................................18

Cylinder Assembly Drawings & Parts Lists..................20

Shipping Kit and Bundle Numbers...............................21

740, 840 & 840G Snowblowers

WARRANTY POLICY

Buhler Manufacturing products are warranted for a period of twelve (12) months (90 days for
commercial application) from original date of purchase, by original purchaser, to be free from
defects in material and workmanship under correct, normal agricultural use and proper
applications.

Buhler Manufacturing’s obligations under this warranty shall be limited to the repair or
exchange, at Buhler Manufacturing’s option, of any Buhler Manufacturing product or part which
proves to be defective as provided. Buhler Manufacturing reserves the right to either inspect
the product at the buyer’s location or have it returned to the factory for inspection.

The above warranty does not extend to goods damaged or subject to accident, abuse or misuse
after shipment from Buhler Manufacturing’s factory, nor to goods altered or repaired by anyone
other than an authorized Buhler Manufacturing representative.

Buhler Manufacturing makes no Express Warranties other than those, which are specifically
described. Any description of goods, including any references and specifications in catalogues,
circulars and other written material published, is for the sole purpose of identifying goods and
shall conform to such descriptions. Any sample or model is for illustrative purposes only and
does not create an Express Warranty that the goods conform to sample or model shown.

The purchaser is solely responsible for determining suitability of goods sold. This warranty is
expressly in lieu of all other warranties expressed or implied. Buhler Manufacturing will in no
event be liable for any incidental or consequential damages whatsoever. Nor for any sum in
excess of the price received for the goods for which liability is claimed.

WARRANTY CLAIMS:

Warranty requests must be prepared on Buhler Manufacturing Warranty Claim Forms with all
requested information properly completed. Warranty Claims must be submitted within a thirty
(30) day period from date of failure repair.

WARRANTY LABOR:

Any labor subject to warranty must be authorized by Buhler Manufacturing. The labor rate for
replacing defective parts, where applicable, will be credited at 100% of the dealer’s posted shop
rate. Defective parts will receive an extra 10% discount to assist with freight or other incidental
costs.

GOVERNMENT LEGISLATION:

Warranty terms and conditions are subject to Provincial or State legislation.

IMPORTANT FACTS:

Buckets and Bucket Tines Carry No Warranty
Bent Spears Carry No Warranty
Snowblower Fan Shafts Carry No Warranty
Mower Blades Carry No Warranty
Portable Auger Parts Have Two (2) Year Warranty
Loader Parts Have Two (2) Year Warranty

IMPORTANT NOTE: This warranty does not apply to rentals

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740, 840 & 840G Snowblowers

SNOWBLOWER

This manual is for model #740 & #840 snowblowers with an open gear gearbox and for
model #840G snowblower, which has a sealed oil bath gearbox. When ordering parts,
specify model number and serial number. The snowblower is the push type and will
mount to a tractor with a 540 rpm PTO. It is supplied with category 1 pins and also
bushings, which convert the pins to a category 2. A category 1 quick hitch fits on all
three sizes. A category 2 quick hitch also fits #840 and #840G models. This 84" wide
snowblower comes with a hydraulic chute control as standard equipment. A hand crank
chute control is available. There is a shear bolt on the auger and on the PTO shaft to
protect the machine from damage if a large object is picked up. Any smaller objects in
the snow will be thrown with it and could cause serious injury. Do not let anyone stand
behind the tractor in the area of the discharged snow.

WHEN ORDERING PARTS

Always give your dealer the Model and
Serial Number of your machine to assist
him in ordering and obtaining the correct
parts. Use the exploded view and
tabular listing of the area of interest to
exactly identify the required part.

#1
#1

#2

#2 #3
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740, 840 & 840G Snowblowers

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.
a) The spout clamps and rings should be periodically lubricated with

b) PTO shaft universal joints and square shaft slide should be greased
c) Regularly oiling the chain will significantly increase the life of the
d) The grease fitting on the hydraulic spout swivel arm should be kept
e) For #740 & #840 only: Gearbox is open type and need not be

Lubrication:

gun grease.
daily.
chain.
lubricated.
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.

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740, 840 & 840G Snowblowers

OPERATING INSTRUCTIONS – cont’d.

9. Periodically check all bolts for tightness. The bolt holding on the fan and
the bearing bolts are of particular importance.

10. Danger: Always stop blower for servicing or unplugging. The PTO
should be disengaged before dismounting from the tractor.

11. CAUTION: Always check to see that both ends of the PTO shaft
are securely attached as per instructions every time you are preparing to
use the snowblower.

12. Shear Sprocket: The Shear Sprocket (#52) should be checked at the
beginning of every season to make sure it will spin freely. With time this
sprocket could corrode and seize which will not allow the shear bolt to
break if something jams in the snowblower auger. Clean to loosen if
necessary.

13. When replacing bearings or tightening a loose bearing collar, always
tighten collar in the direction of shaft rotation using a center punch or a
similar tool.

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740, 840 & 840G Snowblowers

ASSEMBLY INSTRUCTIONS

1. #740: Turn the bottom tube weldments (#9) as shown in drawing and slide them

into the sleeve welded to the main body.
#840 & #840G: Turn the bottom tubes (#93) as shown in drawing and slide them
into the sleeve welded to the main body.
ALL SIZES: The correct position for each individual tractor will be determined
when mounting the snowblower on the tractor. These tubes are connected to the
sleeves with a ¾” x 4 ¼” pin (#96) and a hair pin clip (#104).

2. #740: Bolt the left (#20) and the right (#21) a-frames to the inside of the

plates welded to the hitch tubes using 7/8” x 2 ½” hex bolts (#102) and
lock nuts. Join the top of the hitch arms by bolting a 1” o.d. x 2” spacer
(#100) between the top plates using a ¾” x 4” bolt, lock washer and hex
nut through the lower outside holes. Bolt the upper hitch tube weldment
(#47) between the same plates using the same size of bolt. Use the
inside holes on the top plates for the upper tube. The other end of the top
hitch tube bolts between the welded brackets on the top edge of the fan
housing with the same hardware. Tube must be turned as shown in
drawing. Tighten all hardware.
#840 & #840G: Turn the hitch weldment (#4) as shown in drawing. Bolt
the hitch to the two bottom tubes (#93) using 7/8” x 5” bolts (#103) and
lock nuts. The upper hitch tube (#80) bolts to the top of the hitch and the
welded brackets on the top edge of the fan housing using ¾” x 4” bolts
(#97), lock washers and hex nuts. Tube must be turned as shown in
drawing. Tighten all hardware.

3. #740: A category 1 top link pin (#18) is fitted in the top holes of the hitch

arm plates. This pin is used for standard three-point hitch only. The
bushing in the lower holes is used for the quick hitch.
#840 & #840G: The hitch fits standard category 1 and 2 three-point
hitches as well as category 1 and 2 quick hitches. The highest and lowest
holes are for standard three-point only. The inside set of holes must be
used for a quick hitch. Adaptor bushings are supplied to convert from
category 1 or 2.

4. Mount the discharge spout (#6) using the spout clamps (#59) bolted to the

spout ring on the snowblower. Lubricate the spout ring and clamps.

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740, 840 & 840G Snowblowers

ASSEMBLY INSTRUCTIONS – cont’d.

5. Hydraulic spout swivel:

a) Mount the swivel arm (#60) onto the swivel pin welded to the back

corner of the fan housing using a 1" I.D. washer (#29) and a 3/16" x
1 ½” cotter pin (#62).

b) Wrap cable (#61) around spout and clamp to the ends of the swivel using

3/16" cable clamps (#17).

c) With the swivel in extended position (i.e. cylinder fully extended) and the

spout turned to the right, clamp the cable to the spout cable anchor using
a ¼” cable clamp (#84). Ensure that the spout is not jammed and that
there is no slack in the cable.

d) Use a standard 8" stroke cylinder (20 ¼” min., 28 ¼” max. pin centers).
e) Note: A hydraulic cylinder and hose kit to control the spout deflector is

available as an option.

6. Hand Crank (Option):

a) Fasten hand crank assembly (#5) using two ½” x 1 ¼” hex bolts, lock

washers and hex nuts.

b) Thread cable (#7) through hole in hand crank to even lengths and wrap

around the tube to each side of the hole four turns in opposite directions.

c) Turn spout to center forward position and clamp cable to cable anchor on

far side of spout using clamp (#84).

7. Mounting blower on tractor:

a) Mount the blower on a tractor with a category 1 or category 2 hitch.
b) Using tape or bright colored marking pen, mark on the outer shields the

position where the shaft is completely pushed together and the position
where you have a 4" overlap. Watch these marks when moving the
blower through all possible operating angles to see that the PTO shaft
stays within this range.

c) With the engine on the tractor shut off, attach the PTO shaft. The tractor

end has a standard 6-spline end with a spring loaded locking collar. The
Snowblower end has a clamp-style yoke with a 3/8" keyway. Slide the
yoke onto the gearbox shaft with the 3/8" key supplied. Lock the yoke in
place with the ½” x 3" hex bolt and lock nut fitted through the groove in the
gearbox shaft. After tightening the bolt, insert and tighten the 3/8" socket
set screw supplied. CAUTION : Always check to see that both
ends of the PTO shaft are securely attached every time the Snowblower is
used. This should always be done with the Tractor engine off.

d) Check that the PTO shaft does not bottom or separate with the blower in

the extreme high and low positions. A longer optional PTO shaft is
available if the standard shaft is too short. Check for free movement of all
parts in various raised positions; particularly the PTO shaft .

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