FHM SG24 Application guide

Farmer-HelperSG24 Stump Grinder 1 Revision 12-12-2017
Specificationssubjecttochangewithoutnotice.
Specificationssubjecttochangewithoutnotice.
OPERATION & PARTS MANUAL
Please read these instructions carefully before using!
Always grease all fittings and be sure to always check and
fill with oil before operating! Retain this manual for future
reference. Uses Approximately 1 quart 80-90 gear lube
SG24 STUMP GRINDER
Save This Manual for Future Reference

Farmer-HelperSG24 Stump Grinder 2 Revision 12-12-2017
TABLE OF CONTENTS
INTRODUCTION------------------------------------------------------------------------------ 2
INTENDED USE------------------------------------------------------------------------------- 3
TECHNICAL SPECIFICATIONS---------------------------------------------------------- 3
GENERAL SAFETY RULES--------------------------------------------------------------- 4
PERSONAL SAFETY------------------------------------------------------------------------ 5
TOOL USE AND CARE--------------------------------------------------------------------- 6
STUMP GRINDER SET-UP PROCEDURES------------------------------------------ 7
MAINTENANCE------------------------------------------------------------------------------- 8
REPLACING TEETH------------------------------------------------------------------------- 9
STUMP GRINDER ASSEMBLY & PARTS LIST------------------------------------- 10~13

Farmer-HelperSG24 Stump Grinder 3 Revision 12-12-2017
Page 1_ of _13
INTRODUCTION
Congratulations on your purchase and welcome to FHM. This manual gives you the
necessary information about your machine so you will be able to use it properly.
The entire manual must be read and understood before you start using the machine.
If any questions should arise that are not covered by this manual, please contact FHM.
OWNER'S RECORD
Please take a moment to record the following information about your stump grinder.
If you need to call for assistance, please be ready to provide your model number.
This information will allow us to help you more quickly when you call.
MODEL NUMBER
SERIAL NUMBER
DATE OF PURCHASE
This machine is designed for certain applications only. We strongly recommend this
machine is not modified and/or used for any application other than that for which it was
designed. If you have any questions relative to a particular application, DO NOT use the
machine until you have first contacted us to determine if it can or should be performed on
the product.
For technical questions and replacement parts, please contact FHM.

Farmer-HelperSG24 Stump Grinder 4 Revision 12-12-2017
INTENDED USE
This stump grinder is designed for grinding stumps using a tractor PTO at 540 RPM.
TECHNICAL SPECIFICATIONS
Model SG24 SG24-PRO
Recommended HP 30 HP - 50 HP
Rotor Size 24"
Number of Teeth 36 54
Tooth Construction Carbide steel bolt-in
Required PTO Speed 540 RPM
Cutting Wheel Speed 950 RPM
Cutting Height 18” above ground
Cutting Depth 8” below ground
Maximum Cutting Depth (per pass) 6”
Maximum Horizontal Cut 26”
Swing Arc 40°
Hitch Category Cat. I or II
Shipping Weight 280kg

Farmer-HelperSG24 Stump Grinder 5 Revision 12-12-2017
GENERAL SAFETY RULES
WARNING!
Read and understand all instructions. Failure to follow all instructions
listed below may result in electric shock, fire and/or serious injury.
WARNING!
The warnings, cautions, and instructions discussed in this instruction
manual cannot cover all possible conditions or situations that could
occur. It must be understood by the operator that common sense and
caution are factors which cannot be built into this product, but must
be supplied by the operator.
NOTE: All the laws and any regulation having jurisdiction covering the safety
requirements for use of the machine take precedence over the statements in this
manual. Users of this machine must adhere to such regulations.
Only people that have read and understood these instructions are able to use the
stump grinder.
Inspect the stump grinder and tractor at the beginning of every working day and repair
any defects.
Stop the engine and make sure that the machine will not start accidentally while
repairing defects or doing maintenance.
Do not remove the stump grinders safety devices or make them inactive.
Always locate buried wires, cables, and pipelines before grinding.

Farmer-HelperSG24 Stump Grinder 6 Revision 12-12-2017
PERSONAL SAFETY
Stay alert, watch what you are doing and use common sense when operating the
machine. Do not use the machine while you are tired or under the influence of
drugs, alcohol or medication. A moment of inattention while operating machines
may result in serious personal injury.
Dress properly. Do not wear loose clothing, dangling objects, or jewelry. Keep your
hair, clothing and gloves away from moving parts. Loose clothes, jewelry or long
hair can be caught in moving parts. Air vents often cover moving parts and should
be avoided.
Use safety apparel and equipment. Use safety goggles or safety glasses with side
shields which comply with current national standards, or when needed,
a face shield. Use a dust mask in dusty work conditions. This applies to all persons
in the work area. Also use safety shoes, hardhat, gloves, dust collection systems,
and hearing protection when appropriate.
Do not over reach. Keep proper footing and balance at all times.
Remove adjusting keys or wrenches before connecting to the power supply or
turning on the tool. A wrench or key that is left attached to a rotating part of the tool
may result in personal injury.
Never conduct any maintenance or make any other adjustments when the
engine is running. Always shut the engine off, remove the ignition key, and keep
the engine off before carrying out any of the aforementioned procedures. Consult
your engine manual for safe shutdown procedures to prevent accident ignition.
Never allow passengers on the stump grinder.

Farmer-HelperSG24 Stump Grinder 7 Revision 12-12-2017
TOOL USE AND CARE
Always be sure operator is familiar with proper safety precautions and operation
techniques before using machine.
Do not force the machine. Machines do a better and safer job when used in the
manner for which they are designed.
Storing the machine. When the machine is not in use, store it in a dry, secure place
or keep well covered and out of the reach of children. Inspect the machine for
good working condition prior to storage and before re-use.
Maintain the machine. It is recommended that the general condition of the machine
be examined before it is used. Keep the machine in good repair by adopting a
program ofconscientious repair and maintenance in accordance with the
recommended procedures found in this manual. If any abnormal vibrations or noise
occurs, turn the machine off immediately and have the problem corrected before
further use.
Cleaning. Use a pressure washer to clean the carbide teeth while taking care not to
pressure wash the bearings as this may introduce water into areas of the machine
that will result in malfunction or damage.
Use only accessories that are recommended by the manufacturer. Accessories
that may be suitable for another machine may create a risk of injury when used on
this machine.
Always operate the machine with all safety devices and guards in place and in
working order. DO NOT modify or make changes to safety devices. DO NOT
operate the machine if any safety devices or guards are missing or inoperative.
Never leave the machine running unattended.
Never use the machine to grind anything other than stumps or for any purpose
other than grinding stumps as described in this manual.

Farmer-HelperSG24 Stump Grinder 8 Revision 12-12-2017
STUMP GRINDER SET-UP PROCEDURES
TRIMMING THE PTO SHAFT
The stump grinder is shipped with a PTO shaft that can be fitted to most tractors. The
PTO shaft may need to be trimmed depending on your tractor and configuration. Follow
the below steps to ensure that the PTO shaft is fitted to your tractor correctly.
1. Attach the stump grinder to the tractor, but do not install the PTO shaft.
2. Raise the stump grinder using the tractors 3 point hitch system so that the shaft on the
tractor is level with the shaft on the stump grinder.
3. Measure the distance between the locking grooves on the shaft of the tractor and
stump grinder (A) as shown below.
4. Measure the distance between the locking pins on the PTO shaft itself when it is in
the compressed/shortest length (B) as shown below.
5. If (A) is at least 1” longer than (B), the PTO shaft will not need to be cut.
6. If dimension (B) is longer than (A), the PTO shaft will need to be cut. The below
equation may be used to calculate the correct amount to trim.
(B-A) + 1 INCH = C (AMOUNT TO CUT)
7. Once (C) has been calculated; this amount will need to be cut off of BOTH halves of
the PTO shaft.
8. After both halves of the PTO shaft have been cut, use a file to remove any burrs or
sharp edges and slide the shaft together ensuring it telescopes in and out freely.
The PTO shaft can now be attached to the stump grinder and tractor, ready for use.

Farmer-HelperSG24 Stump Grinder 9 Revision 12-12-2017
MAINTENANCE
1. Proper and routine maintenance is critical to operator safety, achieving proper stump
grinding results and in prolonging the life of the machine.
2. For cleaning and maintenance of the stump grinder, switch off the tractor PTO shaft and
turn the engine off.
3. Inspect the unit before each use for loose nuts and worn cutting teeth. Also clean any
build up of debris.
4. After 2 hours of operation, check for loose nuts and worn cutting teeth. Tighten and
replace as necessary.
5. Grease the bearings and the pivot pins on the main housing as needed before each use.
Do not over grease the the bearings as this will blow out the seals and cause premature
bearing failure.
6. Inspect the clutch plates on the PTO shaft periodically to ensure that they are not
seized together. Refer to “PTOShaftClutchRunIn” in the “StumpGrinderSetUp
Procedures” section of the manual.

Farmer-HelperSG24 Stump Grinder 10 Revision 12-12-2017
REPLACING TEETH
1. Disconnect the PTO shaft from the tractor and set the stump grinder on a flat and
level surface.
2. Remove the lock nut using a wrench or socket.
3. Remove the cutting tooth.
4. Install a replacement tooth and lock nut using a
torque wrench set to 160 ft-lbs (215 Nm)