Farm King 740 Product manual

Snowblower
Models 740, 840 & 840G
OperatOr and parts Manual
092010 FK313

3
Table of Contents - 740, 840 & 840G Snowblower
Table of Contents
Introduction .................................................................................................................................4
Safety ............................................................................................................................................5
• Safety ................................................................................................................................5
• General Safety ..................................................................................................................6
• Start-up Safety .................................................................................................................6
• Operation Safety ..............................................................................................................6
• Transport Safety ...............................................................................................................7
• Service and Maintenance Safety ....................................................................................7
• Storage Safety ..................................................................................................................7
• Safety Signs .....................................................................................................................8
• Safety Sign Installation ...................................................................................................8
Assembly ......................................................................................................................................9
• Assembly Instructions .....................................................................................................9
Operation ...................................................................................................................................12
• Theory of Operation ......................................................................................................13
Maintenance ..............................................................................................................................14
• Refilling 840G Gearbox with Oil ...................................................................................14
Bolt Torque .................................................................................................................................15
• Checking Bolt Torque .....................................................................................................15
• Hydraulic Fittings ...........................................................................................................16
• Prevailing Torque Lock Nuts ..........................................................................................16
Parts Drawings ...........................................................................................................................18
• Snowblower Drawings ..................................................................................................18
• Snowblower Parts List ...................................................................................................21
• 840G Snowblower Gearbox Drawing and Parts List ...................................................24
• Snowblower PTO Drawing ............................................................................................26
• Snowblower PTO Parts List ...........................................................................................27
• 1.75 x 5 Cylinder Assembly Drawing & Parts List (Optional) ......................................29
• 3.5 x 8 Cylinder Assembly Drawing & Parts List (Optional) .......................................30
Shipping Kit and Bundle Numbers ..........................................................................................31
Warranty .....................................................................................................................................32
Manufacturer’s statement: for technical reasons Buhler Industries Inc. reserves the right to modify
machinery design and specifications provided herein without any preliminary notice.
Information provided herein is of descriptive nature. Performance quality may depend on soil fertility,
applied agricultural techniques, weather conditions and other factors.

4
Introduction
Farm King has years of snowblower manufacturing expertise and thousands of acreages, farms
and cities depend on Farm King snowblowers.
PTO-driven Farm King snowblowers attach to a tractor’s 3-point hitch. This snowblower is
supplied with Category 2 pins with conversion bushings to Category 3 available. The 740 and 840
snowblowers have open gearboxes. The Y840G has an oil bath gearbox. Adjustable cup type skid
shoes are standard on all models.
Shear bolt protection is provided at the sprocket to the main auger, and is easily accessed by
removing wing nuts and cover at the back of the housing.
A hitch system, which is quick-hitch compatible is standard on all models. A longer 36" PTO shaft is
optional on the Y740 and Y840 models.
Also available is an optional Hydraulic Spout Control. 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 allow anyone to stand
behind the tractor or in the area of the discharged snow.
Keep this manual handy for frequent reference. All new operators or owners must review the
manual before using the equipment and at least annually thereafter. Contact your Farm King
Dealer if you need assistance, information, or additional copies of the manual. Visit our website
at www.buhlerindustries.com for a complete list of dealers in your area.
The directions left, right, front and rear, as mentioned throughout this manual, are as seen facing
in the direction of travel of the implement.
Introduction - 740, 840 & 840G Snowblower

5
Safety - 740, 840 & 840G Snowblower
Safety
Safety Instructions
Remember, YOU are the key to safety. Good safety practices not only protect you, but also the
people around you. Make these practices a working part of your safety program. Be certain that
everyone operating this equipment is familiar with the recommended operating and maintenance
procedures and follows all the safety precautions. Most accidents can be prevented. Do not risk
injury or death by ignoring good safety practices.
The alert symbol is used throughout this manual. It indicates attention is required and identifies
hazards. Follow the recommended precautions.
The safety alert symbol means…
ATTENTION! BECOME ALERT! YOUR SAFETY IS INVOLVED!
CAUTION
The caution symbol indicates a potentially hazardous situation
that, if not avoided, may result in minor or moderate injury. It
may also be used to alert against unsafe practices.
WARNING
The Warning Symbol indicates a potentially hazardous situation
that, if not avoided, could result in death or serious injury, and
includes hazards that are exposed when guards are removed. It
may also be used to alert against unsafe practices.
DANGER
The Danger Symbol indicates an imminently hazardous situation
that, if not avoided will result in death or serious injury. This
signal word is to be limited to the most extreme situations,
typically for machine components that, for functional purposes,
cannot be guarded.

6
Safety - 740, 840 & 840G Snowblower
General Safety Instructions
• Have a first-aid kit available for use and know how to use it.
• Have a fire extinguisher available, stored in a highly visible location, and know how to use it.
• Wear appropriate protective gear. This list may include but is not limited to:
- hard hat
- protective shoes with slip resistant soles
- protective glasses or goggles
- heavy gloves
- wet weather gear
- hearing protection
- respirator or filter mask
• Read and understand the Operator’s Manual and all safety signs before operating, servicing,
adjusting, repairing, or unplugging the equipment.
• Do not attempt any unauthorized modifications to your Farm King product as this could affect
function or safety, and could affect the life of the equipment.
• Never start or operate the snowblower except from the operator’s station on the power unit.
• Inspect and clean the working area before operating.
• Keep hands, feet, clothing, and hair away from moving parts.
• Ensure bystanders are clear of the area before operating.
Start-Up Safety
• Do not let inexperienced operators or children run this equipment.
• Place all tractor and machine controls in neutral before starting.
• Operate only with ROPS and seatbelt equipped tractors.
• Do not operate inside a building unless there is adequate ventilation.
• Ensure all shields are in place and in good condition before operating.
• Stay clear of PTO shaft and machine when engaging PTO.
Operation Safety
• Do not permit riders.
• Do not wear loose fitting clothing during operation.
• Do not allow anyone other than the operator close to the Auger when in operation.
• Stay clear of snowblower augers.
• Stay clear of snowblower discharge chute. Rocks or debris can be picked up and thrown.
• Never operate over 540 PTO rpm speed.
• Never operate equipment in the raised position.

7
Safety - 740, 840 & 840G Snowblower
Transport Safety
• Review Transport Safety instructions in tractor manual before moving.
• Check with local authorities regarding transport on public roads. Obey all applicable laws
and regulations.
• Make sure the SMV (Slow Moving Vehicle) emblem and all the lights and reflectors that are
required by the local highway and transport authorities are in place, are clean, and can be
seen clearly by all overtaking and oncoming traffic.
• Never have the equipment in operation during transport.
• Always travel at a safe speed.
Service and Maintenance Safety
• Stop engine, set brake, remove ignition key, and wait for all moving parts to stop before
servicing, adjusting, repairing, or unplugging.
• Support the equipment with blocks or safety stands before working beneath it.
• Follow good shop practices including:
- keep service area clean and dry
- be sure electrical outlets and tools are properly grounded
- use adequate light for the job.
• Use only tools, jacks, and hoists of sufficient capacity for the job.
• Replace and secure all shields removed during servicing before operating.
• Use heavy leather gloves to handle sharp objects.
• Check hydraulics regularly for leaks. Use cardboard to look for leaks, and use hand and eye
protection.
• Relieve pressure on hydraulic system before repairing or adjusting.
Storage Safety
• Store the unit in an area away from human activity.
• Do not permit children to play on or around the stored machine.
• Support the frame on stands and blocks to provide a secure base.

8
Safety - 740, 840 & 840G Snowblower
Safety Signs
• The following illustration shows the approximate location and detail of safety signs.
• Keep all safety signs clean and legible and replace any that are damaged or missing.
• When original parts are replaced, any safety signs affixed to those parts should be replaced
as well. Replacement safety signs are available from your local dealer.
Installation
• To install safety signs, ensure the installation area is clean and dry. Decide on the exact
position before you remove the backing paper. Remove the smallest portion of the split
backing paper and align over the specified area. Carefully press in place.
• Slowly peel back the remaining paper and smooth the remaining portion in place. Small air
pockets can be pierced with a pin and smoothed out.
• Replace safety signs immediately should they become damaged, torn or illegible. Obtain
replacements from your authorized dealer using the part numbers shown.
12
3
SERIAL NUMBER
2
1
3
3

9
Assembly - 740, 840 & 840G Snowblower
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 3/4" x 4-1/4" pin
(#96) and a hair pin clip (#103).
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 2-1/2" hex bolts (#101) and lock nuts. Join the top of the hitch arms by
bolting a 1" O.D. x 2" spacer (#19) between the top plates using a 3/4" 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 weldments (#4) as shown in drawing. Bolt the hitch to the two
bottom tubes (#93) using 7/8" x 5" bolts (#102) 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 3/4" x 4"
bolts (#97), lock washers and hex nuts. Tube must be turned as shown in drawing. Join the top
of the hitch arms by bolting a 1" O.D. x 2" spacer (#19) between the top plates using a 3/4" x 4"
bolt, lock washer and hex nut through the lower outside holes. 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.
5. Hydraulic Spout Swivel:
- 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 1-1/2" cotter pin (#62).
- Wrap cable (#61) around spout and clamp to the ends of the swivel using 3/16" cable
clamps (#17).
- 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 1/4" cable clamp (#84). Ensure
that the spout is not jammed and that there is no slack in the cable.
- Use a standard 8" stroke cylinder (20-1/4" min., 28-1/4" max. pin centers).
-NOTE: A hydraulic cylinder and hose kit to control the spout deflector is available as an
option.

10
Assembly - 740, 840 & 840G Snowblower
6. Hand Crank (Option)
- Fasten hand crank assembly (#5) using two 1/2" x 1-1/4" hex bolts, lock washers and hex
nuts.
- 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.
- Turn spout to center forward position and clamp cable to cable anchor on far side of spout
using clamp (#84).
7. Mounting Snowblower on Tractor
- Mount the snowblower on a tractor with a Category 1 or Category 2 hitch.
- 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.
- With the tractor engine 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 1/2" 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.
- Check that the PTO shaft does not bottom out or separate with the snowblower in the
extreme high and low positions. Check to see which of the four different hitch positions
will allow you to keep about a 4" minimum overlap on the PTO shields without bottoming
out. This position varies between different tractor models because of the different lengths
of the three-point arms. If the PTO shaft is still too long with the hitch fully extended, the
PTO shaft will have to be cut shorter. Check for free movement of all parts in various raised
positions, particularly the PTO shaft.

11
Assembly - 740, 840 & 840G Snowblower
8. PTO Shield:
- All snowblowers are supplied with a PTO shield. Bolt the shield (#74) to the hinges on the
top of the gearbox on both the 740 and 840 snowblowers using 1/4" x 1/2" hex bolts, lock
washers and hex nuts. Insert a 3/16" cotter pin in the hole in the shield and in the hole at
the bottom corner of the gearbox. Fold back the cotter pins to hold them in place. Hook
the ends of the spring (#71) into these cotter pins to hold the shield down. To mount the
shield (#74) on the 840G snowblower, remove the two rear bolts at the top of the gearbox
(#63). Bolt the PTO shield to the gearbox plate using these same bolts. Insert a 3/16" cotter
pin in the hole in the shield and fold to lock in place. Hook one end of the spring (#71) into
this cotter pin and the other end into a hole in the lower gearbox plate to hold the shield in
place.
CAUTION Do not run the snowblower without this shield in place.

12
Operation - 740, 840 & 840G Snowblower
Operation Instructions
1. Do not operate the snowblower in the fully raised position. The 3-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° 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.
ALERT 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
snowblower when operating.
4. Run the snowblower at low rpm to check operation before blowing snow.
5. The snowblower has two shear bolts to protect the tractor and snowblower 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 over 600 rpm.
7. Chain Tension: Slack on the lower side of the chain should be 3/8" to 1/2"
8. Lubrication:
- The spout clamps and rings should be periodically lubricated with gun grease.
- PTO shaft universal joints and square shaft slide should be greased daily.
- Regularly oiling the chain will significantly increase the life of the chain.
- The grease fitting on the hydraulic spout swivel arm should be kept lubricated.
- 740 & 840 only: Gearbox is open type and need not be greased
840G only: See Section on refilling for correct oil level. Use any 80-90 gear oil or
multigrade with 80 minimum.
9. Periodically check all bolts for tightness. The bolt holding on the fan and the bearing bolts are
of particular importance.
DANGER Always stop snowblower for servicing or unplugging. The PTO
should be disengaged before dismounting from the tractor.

13



ROTATE SPOUT
LEFT OR RIGHT
FAN BLADE ROTATION
Operation - 740, 840 & 840G Snowblower
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.
10. 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.
11. Shear Sprocket: The shear sprocket (#52) should be checked at the beginning of every season
to make sure it will spin freely. With time the sprocket plate 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.
Theory of Operation

14
Maintenance - 740, 840 & 840G Snowblower
Maintenance
Refilling 840G Gearbox with Oil
• If the gearbox requires refilling with oil because of repairs to the gearbox, add oil to the level
shown in the drawing.
• Check the level regularly using the plug in the lid.
• The correct level is even with the bottom of the plug.

15
Bolt Torque - 740, 840 & 840G Snowblower
Bolt Torque
Checking Bolt Torque
The tables shown below give correct torque values for various bolts and hex bolts. Tighten all bolts
to the torques specified in chart unless otherwise noted. Check tightness of bolts periodically, using
bolt torque chart as a guide. Replace hardware with the same strength bolt.
Bolt Torque*
Bolt Diameter Grade 2 Bolts Grade 5 Bolts Grade 8 Bolts
(inches) SAE 2 SAE 5 SAE 8
“A” (lb-ft) (N.m) (lb-ft) (N.m) (lb-ft) (N.m)
0.25 (1/4) 6 8 9 12 12 17
0.313 (5/16) 10 13 19 25 27 36
0.375 (3/8) 20 27 33 45 45 63
0.438 (7/16) 30 42 53 72 75 100
0.5 (1/2) 45 61 80 110 115 155
0.563 (9/16) 70 95 115 155 165 220
0.625 (5/8) 95 128 160 215 220 305
.75 (3/4) 165 225 290 390 400 540
0.875 (7/8) 170 230 420 570 650 880
1 225 345 630 850 970 1320
Torque figures indicated above are valid for non-greased or non-oiled threads and heads unless otherwise
specified. Therefore, do not grease or oil bolts or hex bolts unless otherwise specified in this manual. When
using locking elements, increase torque values by 5%.
* Torque value for bolts and hex bolts are identified by their head markings.

16
Bolt Torque - 740, 840 & 840G Snowblower
Hydraulic Fittings
Dash Size Thread Size
Jam Nut or Straight
ORB Fitting Torque
SAE 37° (JIC)
Swivel Nut Torque
(lbs-ft) (NM) (lbs-ft) (NM)
-4 (1/4) 7/16-20 16 - 14 20 - 22 11 - 10 13 - 15
-5 (5/16) 1/2-20 20 -18 24 - 27 15 - 13 18 - 20
-6 (3/8) 9/16-18 26 - 24 33 - 35 19 - 17 23 - 26
-8 (1/2) 3/4-16 60 - 50 68 - 78 38 - 34 47 - 52
-10 (5/8) 7/8-14 80 - 72 98 - 110 56 - 50 69 - 76
-12 (3/4) 1-1/16-12 135 - 125 170 - 183 78 - 70 96 - 106
-14 (7/8) 1-3/16-12 180 - 160 215 - 245 90 - 80 110 - 122
-16 (1) 1-5/16-12 220 - 200 270 - 300 104 - 94 127 - 141
-20 (1 1/4) 1-5/8-12 280 - 210 285 - 380 138 - 124 169 - 188
-24 (1 1/2) 1-7/8-12 360 - 270 370 - 490 173 - 156 212 - 235
Prevailing Torque Lock Nuts
Nut Size and
Threads per Inch
Grade B Nuts Grade C Nuts
Nut Tightening Torque Nut Tightening Torque
(lbs-ft) (NM) (lbs-ft) (NM)
Coarse Thread
1/4 - 20 7 - 5 7 - 9 10 - 7 9 - 14
3/16 - 18 12.5 - 9 12 - 17 16 - 11 15 - 22
3/8 - 16 20 - 14.5 20 - 27 28 - 20 27 - 38
7/16 - 14 32 - 23 31 - 43 43 - 31 42 - 58
1/2 - 13 50 -37 50 - 68 62.5 - 45 61 - 85
9/16 - 12 70 - 50 68 - 95 95 - 70 95 - 129
5/8 - 11 95 - 70 95 - 129 122.5 - 90 122 - 166
3/4 - 10 165 - 125 169 - 224 210 - 155 210 - 285
7/8 - 9 250 - 185 251 - 339 312.5 - 225 305 - 423
1 - 8 375 - 275 373 - 508 462.5 - 360 488 - 627
Fine Thread
1/4 - 28 7.5 / 5.5 7 - 10 10 -7 9 - 14
3/16 - 24 13 - 10 14 - 18 17 - 12 16 - 23
3/8 - 24 22 - 16 22 - 30 29 - 21 28 - 39
7/16 - 20 34 - 24 33 - 46 43 - 31 42 - 58
1/2 - 20 52.5 - 37.5 51 - 71 70 - 50 68 - 95
9/16 - 18 77.5 - 57.5 78 - 105 95 - 70 95 - 129
5/8 - 18 97.5 - 72.5 98 - 132 125 - 90 122 - 169
3/4 - 16 165 - 120 163 - 224 210 - 155 210 - 285
7/8 - 14 270 - 200 271 - 266 312.5 - 225 305 - 423
1 - 14 400 - 300 407 - 542 500 - 362.5 491 - 678
1) For Grade A locknut torque specifications refer to Grade B specifications.

18
Parts - 740, 840 & 840G Snowblower
740 & 840 Snowblower Drawings

19
Parts - 740, 840 & 840G Snowblower

20
Parts - 740, 840 & 840G Snowblower
840G Snowblower Drawings