Mighty Mac TPH475 User manual

Saftey & Operating Instructions
Gravity Self-Feeding Chipper
TPH475
Serial No.
P/N: 950-4000
Published: 10/11/2019
MacKissic Inc.
Toll-free phone: [phone]
Website: www.MacKissic.com
Read and understand this manual and all instructions before operating or servicing this 3-Point Hitch MIGHTY MAC
GRAVITY SELF-FEEDING Chipper.

3-POINT HITCH Mighty Mac Gravity Self-Feeding CHIPPER
2
Table of Contents
Chapter 1: GeneralSafety Rules........................................................................................................3
Chapter 2: SettingUpYour3-POINTHITCHMIGHTY MAC GRAVITY SELF-FEEDINGCHIPPER....8
Chapter 3: OperatingYour3-POINTHITCHMIGHTY MAC GRAVITY SELF-FEEDINGCHIPPER....16
Chapter 4: MaintainingYour3-POINTHITCHMIGHTY MAC GRAVITY SELF-FEEDINGCHIPPER.20
Chapter 5: Troubleshooting ..............................................................................................................29
Chapter 6:Chipper Accessories........................................................................................................31
Chapter 7: Parts List and Schematic Diagrams. ................................................................................34
Conventions used in this manual
This indicates a hazardous situation, which, if not followed, will result in death or serious injury.
This indicates a hazardous situation, which, if not avoided, could result in death or serious injury.
This indicates a hazardous situation, which, if not avoided, could result in minor or moderate injury.
Thisinformationisimportantintheproperuseofyourmachine.Failuretofollowthisinstructioncouldresultindamagetoyour
machine or property.
Serial Number
A Serial Number is used to identify your machine and is located on the Serial Number Label on your machine. For your
convenience and ready reference, enter the Serial Number in the space provided on the front cover of this manual.
Additional Information and Potential Changes
MacKissic Inc. reserves the right to discontinue, change, and improve its products at any time without notice or obligation
to the purchaser. The descriptions and specifications contained in this manual were in effect at printing. Equipment
described within this manual may be optional. Some illustrations may not be applicable to your machine.
California Proposition 65

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3
Chapter 1: General Safety Rules
• Readthis Safety & Operating Manual before you use the 3-Point Hitch MIGHTY MAC GRAVITY SELF-FEEDING Chipper.
Become familiar with the operation and service recommendations to ensure the best performance from your machine.
• Thoroughlyinspecttheareainwhichyouwillbeworkingandremoveallforeignobjects.LookforRope,Wire,ECT.,and
remove these objects before chipping. Inserting these objects into the chipper hopper could damage the machine and/or
cause injury.
• Thisisahigh-poweredmachine,withmovingpartsoperatingwithhighenergyathighspeeds.Youmustuseproperclothing
andsafetygearwhenoperatingthismachinetopreventorminimizetheriskofsevereinjury.Thismachinecancrush,grind,
cut and sever parts of your body it they enter the inlet or discharge area of your chipper.
Labels
Your 3-Point Hitch MIGHTY MAC GRAVITY SELF-FEEDING Chipper carries prominent labels as reminders for its proper and
safe use. Shown below are copies of all the safety and operation labels that appear on the equipment. Take a moment to
study them and make a note of their location on your 3-Point Hitch MIGHTY MAC GRAVITY SELF-FEEDING Chipper as
you assemble and before you operate the unit. Replace damaged or missing safety and operation labels immediately.
930-0002
930-0011
930-0023
930-0010

3-POINT HITCH Mighty Mac Gravity Self-Feeding CHIPPER
4
930-0022
091-0458
930-0024
091-0445 091-0385
930-0025

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5
Protecting Yourself and Those Around You
This is a high-powered machine, with moving parts operating with high energy at high speeds. You must operate the
machine safely. Unsafe operation can create a number of hazards for you, as well as anyone else in the nearby area.
Always take the following precautions when using this machine:
• Always wear protective goggles or safety glasses with side shields while chipping to protect your eyes from possible thrown
debris.
• Avoid wearing loose clothing or jewelry, which can catch on moving parts or the material fed into the chipper hopper.
• We recommend wearing gloves while chipping. Be sure your gloves fit properly and do not have loose cuffs or
drawstrings.
• Wear shoes with non-slip treads when using your chipper. If you have safety shoes, we recommend wearing them.
Do not use the machine while barefoot or wearing open sandals.
• Wear long pants while operating the 3-Point Hitch MIGHTY MAC GRAVITY SELF-FEEDING Chipper.
• Use ear protectors or ear plugs rated for at least 20 dba to protect your hearing.
• Never allow people who are unfamiliar with these instructions to use the chipper. Allow only responsible individuals
who are familiar with these rules of safe operation to use your machine.
• Never place your hands, feet, or any part of your body in the chipper hopper, discharge opening, or near or under any
moving
part while the machine is running. Keep area of discharge clear of people, animals, buildings, glass, or anything else
that will obstruct clear discharge, cause injury, or damage. Wind can also change discharge direction, so be aware. If it
becomes necessary to push material into the chipper hopper, use a small diameter stick, not with your hands.
• Keep bystanders 100 feet away from your work area at all times. Wood chips exit the chipper at great speeds. To be
safe, do
not operate the machine near small children or pets, and never allow children to operate the chipper. Stop the engine
when another person or pet approaches.
• Never use the machine without ensuring that all guards and shields are in place, including the chipper hopper,
discharge
chute and blowback shield.
• Always operate the machine from the operator zone (see chapter 4). Never pass or stand on the discharge
side of the machine when the engine is running or the flywheel is turning.
• Never transport the Chipper with the PTO engaged and the Flywheel turning.
• Clear the area of objects such as wire and rope, etc. Inserting these objects into the chipper hopper could
damage the flywheel and/or cause injury.
• Never, under any conditions, remove, bend, cut, fit, weld, or otherwise alter standard parts on the 3-point hitch MIGHTY
MAC GRAVITY SELF-FEEDING Chipper. This includes all shields and guards. Modifications to your machine
could cause personal injuries and property damage and will void your warranty.
Safety for Children and Pets
Tragic accidents can occur if the operator is not alert to the presence of children and pets. Children are often attracted to
the machine and the chipping activity. Never assume that children will remain where you last saw them. Always follow these
precautions:
• Keep children and pets at least 100 feet from the working area and under the watchful care of a responsible adult.
• Be alert and turn the machine off if children or pets enter the work area.
• Never allow children to operate the 3-Point Hitch MIGHTY MAC GRAVITY SELF-FEEDING Chipper.

3-POINT HITCH Mighty Mac Gravity Self-Feeding CHIPPER
6
General Safety
Operating this chipper safely is necessary to prevent or minimize the risk of death or serious injury. Unsafe operation can
create a number of hazards for you. Always take the following precautions when operating this chipper:
• This machine is designed to operate at 540 rpm only! Never operate the machine at a faster speed; doing so can cause
serious injury to the operator or bystanders and could cause damage to the machine that is not covered under
warranty.
• The Mighty Mac 3-Point Hitch Chipper must be operated with the weight of the machine on the ground. Operating the
machine while it is off the ground can result in injury to yourself or others, or can cause damage to the machine
which is not covered under warranty.
• Keep in mind that the operator or user is responsible for accidents or hazards occurring to other people, their property,
and
themselves.
• Your 3-Point Hitch MIGHTY MAC GRAVITY SELF-FEEDING Chipper is a powerful tool, not a plaything. Exercise extreme
caution at all times. The design of this machine is to chip wood. Do not use it for any other purpose.
• Know how to stop the chipper quickly by disengaging the PTO and shutting down the tractor.
• Operate this machine on a level surface only. Never operate your unit on a slippery, wet, muddy, or icy surface.
Exercise caution to avoid slipping or falling.
• Keep your face and body back from the chipper hopper to avoid accidental bounce back of any material.
• When feeding material into the chipper hopper, be extremely careful that pieces of metal, rocks, or other foreign
objects are not included. Personal injury or damage to the machine could result.
• Whenever you leave the operating position or if you have to remove processed material, leaves, or debris from the
machine,
always disengage the PTO, shut down the tractor engine, remove the key, wait for all moving parts to come to a
complete stop, disconnect the PTO shaft from the tractor, then wait 5 minutes before removing processed material,
leaves, or debris from the machine.
• If the cutting mechanism strikes a foreign object or if your machine should start making an unusual noise or vibration,
immediately disengage the PTO, shut down the tractor engine, remove the key, wait for all moving parts to come to a
complete stop, disconnect the PTO shaft from the tractor, then wait 5 minutes before inspecting for clogging or
damage. Vibration is generally a warning of trouble. Clean and repair and/or replace damaged parts.
• Never tamper with safety devices. Check their proper operation regularly.
• Stay alert for hidden hazards or traffic. Never carry passengers on your machine.
• Never overload or attempt to chip material beyond the manufacturer’s recommendation; see chapter 4. Personal
injury or damage to the machine could result.
• While using the 3-Point Hitch MIGHTY MAC GRAVITY SELF-FEEDING Chipper, don't hurry or take things for granted.
When in doubt about the
equipment or your surroundings, stop the machine and take the time to look things over.
• Never operate the machine when under the influence of alcohol, drugs, or medication.
• Use the machine only in daylight.
• Keep all nuts and bolts tight and keep the equipment in good operating condition.
• Your 3-Point Hitch MIGHTY MAC GRAVITY SELF-FEEDING Chipper is driven by a PTO shaft that transfers power
from your tractor. A PTO shaft is extremely dangerous and can cause serious injury or death. Read and understand all of
the safety and operating instructions manual that came with your PTO shaft.

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7
Transportation Safety
• Before transporting, be certain the 3-Point Hitch MIGHTY MAC GRAVITY SELF-FEEDING Chipper is correctly and
securely attached to your tractor and the safety chains of the PTO are in place.
• Make sure the 3-Point Hitch MIGHTY MAC GRAVITY SELF-FEEDING Chipper is raised high enough to clear all
obstacles during transportation.
• Never transport the machine for long distances.
• Never allow anyone to ride on the 3-Point Hitch MIGHTY MAC GRAVITY SELF-FEEDING Chipper.
• Never transport anything on the machine.
• Never transport the 3-Point Hitch MIGHTY MAC GRAVITY SELF-FEEDING Chipper with the PTO engaged.
• Obey local, state, and federal regulations when transporting the machine on public roads and highways.
• Allow for added length in driving situations, e.g., when turning, parking, and crossing intersections.
• Adjust your transportation speed for terrain and conditions.
• Use caution when backing or turning. Be aware of the large turning radius required with the 3-Point Hitch MIGHTY
MAC GRAVITY SELF-FEEDING Chipper attached to your tractor.
A Note to All Users
No list of warnings and cautions can be all-inclusive. If situations occur that are not covered by this manual, the operator
must apply common sense and operate this 3-Point Hitch MIGHTY MAC GRAVITY SELF-FEEDING Chipper in a safe
manner. Contact us at www.MacKissic.com or call 1-800-348-1117 for assistance.

3-POINT HITCH Mighty Mac Gravity Self-Feeding CHIPPER
8
Chapter 2: Setting Up Your 3-POINT HITCH MIGHTY MAC GRAVITY SELF-FEEDING CHIPPER
This chapter outlines unpacking and a few simple steps you will need to follow to set up your new machine before you
use it. It may be helpful to familiarize yourself with the controls and features of your 3-POINT HITCH MIGHTY MAC GRAVITY
SELF-FEEDING CHIPPER as shown in Figure 1 before beginning these procedures. If you have any questions at all,
please feel free to contact us at www.MacKissic.com or call our Customer Service Representatives at our toll free
number: 1-800-348-1117.
3- POINTHITCHMIGHTY MAC GRAVITY SELF-FEEDINGCHIPPERControlsandFeatures
Chipper
Knife
Wear
Plate
Flywheel
Bearing
Idler
Pulley
Belt
Belt
Tensioner
PTO
Bearing
Cover Removed for Clarity
2-Groove
Sheave
Figure 1
Blow-Back
Shield
Hopper
Assembly
Chipper
Knife Access
Belt
Guard
Support
Leg
3-Point Hitch
Mounting Pin
Discharge
Chute
Idler
Pulley
Flywheel
Bearing
Belt
Belt
Tensioner
PTO
Bearing
2-Groove
Sheave

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9
Specifications
Tractor Horsepower
Category 1 –45 HP Max.
Drive
Tractor PTO
PTO Speed
540 RPM
PTO Shaft Extension Sheave
14" –2 Groove 3V
Chipping Capacity
4-3/4"
Rotor Speed
2,071 RPM
Rotor Pulley
3.65" DIA., 2 Groove 3V
Number of Chipper Knives
1
Chipper Knife Size
6-1/4" X 1-1/4" X 9/32"
Chipper Knife Material
Heat Treated Tool Steel
Adjustable Knife Wear Plate
Yes
Chipper Flywheel
17-3/4" DIA., 5/8" THK
Flywheel Weight
50 LBS.
Chipper Housing Material
7 GA Steel
Hopper Material
14 GA Steel
Belt
3V x 560/2 Groove
Belt Adjustment
Spring Loaded Idler Pulley
Hopper Opening at Top
17" X 27"
Chipper Weight w/PTO Shaft
295 lbs.
Shipping Dimensions
54" L x 46" W x 46" H
Shipping Weight
382 lbs
Assembling the 3-POINT HITCH MIGHTY MAC GRAVITY
SELF-FEEDING CHIPPER
Parts supplied (Figure 2):
• 3-POINT HITCH MIGHTY MAC GRAVITY SELF-FEEDING
CHIPPER
• Hopper Assembly
• PTO Shaft Assembly(with PTO Manual)
• Parts Box containing (Items below and Figure 2):
− Discharge Chute
− Owner’s Manual and Warranty Card
− Hardware Package (Figure 3 and List below)
− Safety Glasses, Hearing Protection, Work Gloves
Hardware Package Parts:
Figure 2
Figure 3
Discharge
Chute
Owner’s
Manual
Warranty
Card
Bolt Bag
Glasses
Gloves
Hearing
Protection
PTO
Assembly
1
2
3
4
5
6
7
8
9
10

3-POINT HITCH Mighty Mac Gravity Self-Feeding CHIPPER
10
Figure 4
Figure 5
Attaching the Hopper Assembly
Note: We recommend that you have someone help you lift the Hopper in
place and support it until it is secured to the Chipper.
Tools Needed:
• One 1/2" Wrenches
1. Gather x8 5/16- 18 x 3/4” Truss Head Bolts, x8 5/16- 18 Think Nylon
Locknuts, and x8 5/16 SAE washers from your Bolt Bag.
2. Place the Hopper Assembly inside of the Hopper Neck.
3. From the inside of the Hopper Assembly, Insert a Truss Head Bolt
through the holes (x4 each side of Hopper), place a 5/16 SAE washer
over the protruding bolt threads, and secure using a Think Nylon
Locknut on the outside (Figure 4).
Attaching the Discharge Chute
Tools Needed:
• Two 1/2" Wrenches
1. Remove the two 5/16-18 x 4-1/4" Bolts and Locknuts at the top
of the Chipper Assembly using two 1/2" Wrenches (Figure 5).
2. Position the Discharge Chute with the discharge opening facing away
from the Hopper as shown and secure with the two Bolts and Locknuts
using two 1/2" Wrenches.
Bolts and
Locknuts
Discharge
Chute
Hopper Assembly
Install
Hardware
Hopper Neck

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11
Installing Lift Arm Pins
There are two styles of Pins we use for the Lift Arm Pins. One style has a
shoulder and the other style does not. Installation methods for both styles
are explained here so follow the steps that apply to the style you received.
Tools Needed:
• Large Philips Screwdriver (or Shaft)
• Large Flat Head Screwdriver (or Pry Bar)
• Large Adjustable Wrench
• Tape Measure (needed to install pin with no shoulder only)
PIN INSTALLATION (WITH SHOULDER)
1. Position the Lock Washer and the Hex Nut inside the plate and
channel (Figure 6).
2. Insert the threaded end of the Lift Arm Pin through the pin plate of the
frame and thread it through the Hex Nut as far as you can by hand.
3. Hold the Hex Nut in place by inserting a large Screwdriver or Pry Bar
into the Channel and under the Nut.
4. While holding the Hex nut, insert a large Screwdriver or Shaft into the
hole at the end of the Pin and turn the Pin clockwise until tight.
5. Install the thin Hex Nut at the threaded end of the Pin and tighten
with an Adjustable Wrench (Figure 7).
6. Repeat steps 1 thru 5 for the other side.
Note: The orientation (pointing vertical or horizontal) of the hole at the end of
the Pin is not important.
PIN INSTALLATION (NO SHOULDER)
1. Position the Hex Nut inside the plate and channel (Figure 8).
2. Insert the threaded end of the Lift Arm Pin through the pin plate of
the frame and thread it into the Hex Nut.
3. Push the Pin in so the Locknut rests against the Frame and screw the
Pin in or out until the distance from the Pin Plate to the center of the
hole in the end of the Pin is 2-3/16" (1.1875).
4. Install the Lock Washer and thin Hex Nut onto the threaded end of
the Pin by hand (Figure 9).
5. Insert a large Screwdriver or Shaft into the hole at the end of the Pin
and to ensure the Pin does not turn as you tighten the thin Hex Nut
with an adjustable Wrench.
6. Repeat steps 1 thru 5 for the other side.
Note: The orientation (pointing vertical or horizontal) of the hole at the end of
the Pin is not important.
Frame
Hex Nut
LockWasher
Screwdriver
or Pry Bar
Figure 6
Figure 7
Figure 8
Thin Hex
Nut
Lock
Washer
Screwdriver
or Shaft
Lift Arm
Pin
Hold in
Position
Figure 9
Hex Nut
2-3/16"
Screwdriver
or Shaft
Lift Arm
Pin
Hex Nut
Lock Washer
Screwdriver
or Pry Bar
Lift Arm
Pin
Hex Nut
Against frame
Hold in
Position
Lock
Washer

3-POINT HITCH Mighty Mac Gravity Self-Feeding CHIPPER
12
Attaching the 3-POINT HITCH MIGHTY MAC GRAVITY
SELF-FEEDING CHIPPER
Before performing the following procedure, be sure your tractor engine is off,
brake is set, and the key removed for safety.
Figure10
Figure11
Figure12
Upper (pivot)
DraftArm
Tractor
Hitch Pin
Mounting
Bracket
Note: The PTO Driveshaft provided with your new machine is sized to fit a
standard category 1 PTO (1-3/8" DIA. x 6" Spline).
The PTO shaft on the tractor that is to use this machine must
rotate clockwise when viewing the PTO from the rear of the tractor. If the
PTO rotates counterclockwise, you must have your tractor modified by
installing a gearbox to reverse the direction of rotation.
The length of the PTO Driveshaft that is included with your new machine may
need to be modified. See the procedure for checking the PTO Shaft length
needed and modification instructions in this chapter.
1. Back the Tractor to the Chipper and position the Lower Draft Arms
near the Chipper Hookup Pins (Figure 10).
2. Slide the Lower Draft Arms onto the Chipper Hookup Pins and secure
with Tractor Hitch Pins (Figure 11).
3. Position the Upper Draft Arm inside the Mounting Bracket and align
with the Mounting Bracket Holes (Figure 12).
4. Insert the Tractor Hitch Pin to secure the Upper Draft Arm to the Chipper.
Calculating length of PTO Shaft needed
The PTO Shaft provided with your Chipper is 27" overall compressed length and
will work for most applications without modifications. Before you install the PTO
Shaft it is good practice to run through the following dimension checks to
calculate optimum PTO Shaft length to determine if modifications are needed.
Without the PTO Shaft installed, use the table below to record the
dimensions as outlined in the following steps.
SHAFT TO SHAFT MEASUREMENTS
ON GROUND
Inches
SHAFTS LEVEL
Inches
FULLY RAISED
Inches
1. Lower the Chipper all the way onto the ground in the operating
position. Measure from the end of the Tractor PTO Shaft to the end
of the Chipper PTO Shaft and record this dimension in the “ON
GROUND” row of the table above (Figure 13).
Figure 13
Arm
Draft Arms
Shaft
Chipper
Mounting Hole
Upper (pivot) Draft
Arm
Lower (lifting)
Draft Arms
Chipper
Hookup
Pins
Tractor
Hitch Pin
Upper (pivot)
Draft Arm
Mounting
Bracket
Tractor
Hitch Pin
Chipper
Mounting Hole
End of
Chipper PTO
Shaft
Chipper on the
Ground

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13
2. Raise the Chipper up until the Tractor PTO Shaft and Chipper PTO
Shaft are parallel with each other. Measure from the end of the Tractor
PTO Shaft to the end of the Chipper PTO Shaft and record this
dimension in the “SHAFTS LEVEL” row of the table above (Figure 14).
3. Raise the Chipper up as far as it will go. Measure from the end of the
Tractor PTO Shaft to the end of the Chipper PTO Shaft and record this
dimension in the “FULLY RAISED” row of the table above (Figure 15).
Note: If your longest measurement exceeds 32" you will require a longer PTO
Shaft. Do not proceed with installation until you have a longer PTO
Shaft. If you have any questions, please visit us at www.MacKissic.com
or call 1-800-348-1117 .
4. Take the shortest recorded measurement you wrote in the table and
add 2".
5. Take that number and subtract it from 27" (overall compressed length
of the supplied PTO Shaft).
6. This final number is the length that you will need to cut off of the PTO
Shaft for it to fit properly to your Tractor.
EXAMPLE: Let’s assume the shortest center-to-center measurement in
the table is 22".
• 22 + 2 = 24 (step 4 above)
• 27 –24 = 3 (step 5 above)
• You would be required to cut 3" off both halves of the PTO Shaft and 3"
off of the Guard.
Note: If you end up with 0" or a negative number, then no changes are
needed until you reach a maximum long measurement of 32" as
indicated on previous page.
If you have any questions, please visit us at www.MacKissic.com or
call 1-800-348-1117.
Chipper lifted off Ground until
Shaftsarelevelwitheachother
Figure14
Figure15
Endoftractor
PTO shaft
End of Chipper
PTO Shaft
PTO Shaft

3-POINT HITCH Mighty Mac Gravity Self-Feeding CHIPPER
14
Figure16
Figure17
Safety
Guard
3-Philips
Screws
PTO Guard
Modifying the PTO Shaft-if required
The PTO Shaft included with your new MIGHTY MAC Chipper may be too
long for your tractor. To shorten the Driveshaft, proceed as follows:
Tools and Supplies Needed:
• Hacksaw
• Bench Vise
• Tape Measure
• File
• General purpose LithiumGrease
• Philips Head ScrewDriver
1. Separate the PTO Shaft Halves by pulling them apart.
2. Remove the 3 Philips Screws from the PTO shaft Halves (Figure
16) . Remove the PTO Guard.
3. Measure and cut the ends of both Guards the required amount (Figure
17).
NOTE:If you put the Guards in a vise to hold them, be careful not to
clamp it too tight because it could crack the plastic.
4. Measure and cut each Shaft Tubes to the required length using the
hacksaw
(Figure 18).
5. File or sand any burrs from the Shaft ends.
6. Grease both Shaft Tubes and under the Bearing Rings of each Shaft
(Figure 19).
7. Re-install the PTO Guard and tighten the 3- Philips Screws.
8. Slide the two PTO Shaft Halves together.
NOTE: When inserting one half of the PTO Shaft to the other you must line
up the splines correctly (two pointed splines and one flat spline).
See the following section to attach the PTO Shaft to the Tractor and Chipper.
Figure 18
Shaft
Tube
Bearing
Ring
Figure 19
3-Phillips
Screws
Safety
Guard
Shaft Tube
Shaft
Tube
Bearing
Ring

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15
Attaching the PTO Shaft to the Tractor and Chipper
1. Insert the Key into the 3-Point Hitch Drive Shaft of the Chipper (Figure 20).
2. Align the Key Slot of the PTO Shaft with the Key in the Shaft and slide
it onto the Shaft.
You must install the 1/4" X 1/4" X 1-1/4" key supplied in the hardware
package where the PTO shaft attaches to the chipper. Failure to do so
will result in damage to the machine and is not covered under warranty.
NOTE: Do not allow the 3-Point Hitch Shaft to extend more than 1/4" into
the U- Joint. This will allow proper clearance to prevent hitting the
Grease Fitting.
3. Secure the PTO Shaft with the two Set Screws from the Hardware
Package.
NOTE: If you plan to leave the Chipper attached to the Tractor for extended
periods, apply thread lock to the Set Screws to help secure them in
place.
4. Pull the Locking Ring while sliding the PTO shaft onto the Tractor
PTO Spline (Figure 21).
5. Release the Locking Ring and continue sliding the PTO Shaft on
until the Locking Ring releases and locks into the detent in the
Tractor PTO Spline.
6. Secure the PTO Shaft Safety Chains to stationary parts of the Chipper
Frame and Tractor to stop the Guard from turning (Figure 22).
Figure 20
Figure21
Figure22
PTO
Hitch
Drive
Shaft
1/4"
PTO
Shaft
3-Point
Hitch
Drive
Shaft
PTO Shaft
Safety
Chains

3-POINT HITCH Mighty Mac Gravity Self-Feeding CHIPPER
16
Chapter 3: Operating Your 3-POINT HITCH MIGHTY MAC GRAVITY SELF-FEEDING CHIPPER
Thischaptercoverstheproceduresforstartingandstoppingyournew3-POINTHITCH MIGHTY MAC GRAVITY SELF-FEEDING
CHIPPERand discusses basic operationfeatures.
• This machine is designed to operate at 540 rpm only! Never operate the machine at a faster speed; doing so
can cause serious injury to the operator or bystanders and could cause damage to the machine that is not
covered under warranty.
• The Mighty Mac 3-Point Hitch Chipper must be operated with the weight of the machine on the ground. Operating the
machine while
it is off the ground can result in injury to yourself or others, and can cause damage to the machine which is not covered
under warranty.
• The design of this machine is for chipping wood. Never use this machine for any other purpose as it could cause
serious
injury.
• Contact with internal rotating parts will cause serious personal injury. Never put hands, face, feet, or clothing into
chipper hopper or discharge opening or near the discharge area or PTO shaft at any time.
• Disengage PTO, shut down the tractor engine, remove the key, wait for all moving parts to come to a complete stop,
disconnect the PTO shaft from the tractor, then wait 5 minutes before moving or performing maintenance/inspection on
the chipper. Use only a wooden stick to clear jammed material.
• Never operate the machine without the hopper or discharge chute or PTO shaft properly installed.
Starting the Chipper
NOTE: Some tractors may require the use of an Over Running Clutch. Consult your local dealer for more information.
1. Ensure that the Chipper is lowered to the ground and all Guards are in place and properly secured before using.
2. Remove any debris buildup from the machine before every use of the Chipper.
3. Set Tractor throttle at IDLE before engaging PTO with Chipper attached.
4. Increase Tractor throttle to the RUN RPM’s required to obtain 540 PTO speed before chipping.
5. Reduce Tractor throttle to IDLE before disengaging PTO.
NOTE: Check the Drive Belt, if necessary, after an initial break-in period of one (1) hour (see Chapter 5 “Maintaining the 3-
POINT HITCH MIGHTY MAC GRAVITY SELF-FEEDING CHIPPER”).

CONTACT US AT www.MacKissic.com
17
Operation Notes
• Visually check the Chipper Knife for damage before each use of
the machine. See “VISUAL INSPECTION OF THE CHIPPER
KNIFE (before each use)” in Chapter 5 for info on accessing
the Chipper Knife.
• Always operate the Tractor PTO at 540 RPM when chipping.
• Only operate the MIGHTY MAC GRAVITY SELF-FEEDING
CHIPPER from the Operator Zones shown in (Figure 23).
• Keep proper balance and footing while operating the
MIGHTY MAC GRAVITY SELF- FEEDING CHIPPER.
• ALWAYS disengage the PTO when leaving the Operating Zones
or when moving the machine.
• Never move the Chipper while the PTO is turning.
Processing Material
The Chipper is designed to accept wood only. The Chipper Knife mounted on a
revolving flywheel turns branches fed into the Chipper Hopper into “chips”.
The Chipper can chip branches ranging in size up to 4-1/2" in diameter.
Cut your materials into manageable lengths before feeding them into the
Chipper Hopper.
Figure 23
• Always wear protective goggles or safety glasses with side shields while chipping to protect your eyes from possible
thrown debris.
• Avoid wearing loose clothing or jewelry, which might catch on moving parts or the material fed into the chipper hopper.
• We recommend wearing gloves while chipping. Be sure your gloves fit properly and do not have loose cuffs or
drawstrings.
• Wear shoes with non-slip treads when using your chipper. If you have safety shoes, we recommend wearing them.
Do not use the machine while barefoot or wearing open sandals.
• Wear long pants while operating the MIGHTY MAC GRAVITY SELF-FEEDING chipper.
• Use ear protectors or ear plugs rated for at least 20 dba to protect your hearing.
The chipper hopper must be securely bolted to your MIGHTY MAC GRAVITY SELF-FEEDING Chipper and the blowback shield in
place before using the machine!
Use common sense when using the machine. Learn to recognize the change in sounds when overloaded. Disengage PTO and
turn off the tractor engine immediately if the machine becomes jammed to prevent damage to the drive system.
Zone

3-POINT HITCH Mighty Mac Gravity Self-Feeding CHIPPER
18
• Your MIGHTY MAC GRAVITY SELF-FEEDING CHIPPER can process dry or green wood up to 4.75" in
diameter.
• The Chipper will self-feed the wood once it contacts the knife edge so forcing the branches into the
Hopper is not necessary if the knife is sharp.
• Green wood will process quicker and easier than dry wood.
• Softwood processes easier than hardwood.
• Your operator experience will teach you how different types of wood will chip and how fast you can process them.
• When chipping branches, sometimes a tail will develop at the end of a branch. To avoid this, rotate the
branch while feeding it into the Chipper Hopper.
• Rotating the branch as you feed it into the machine will improve chipping performance.
• Use caution with small diameter green saplings and branches less than 2" in diameter. Chip these grouped or
bundled together to provide support for each other. If the material is 2" or larger, feed only one at a time into the
Chipper Hopper.
• Make sure the MIGHTY MAC GRAVITY SELF-FEEDING CHIPPER finishes processing material in the Hopper
before disengaging the PTO and shutting the Tractor engine off.
• Do not force material into the Chipper. If the machine does not chip well, the Chipper Knife may need
sharpening or replacement, or the gap between the Knife and the Wear Plate needs adjusting. See
“Removing, Replacing and Adjusting the Chipper Knife and Wear Plate” in Chapter 5.
• Extremely hard knots will not process very well. Push any short stubs that have not self-fed through the
Chipper, with the next branch to be chipped.
• Cut the material to be chipped into manageable lengths of no more than five or six feet long before chipping
them.
• Overloading the Chipper Hopper will cause the rotor speed to decrease. If you hear the engine RPM
decreasing, stop feeding material into the Chipper Hopper until the engine has returned to full speed.
Never throw remaining stubs or knots into the chipper hopper; damage will result.

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19
To Free a Jammed Flywheel
Disengage PTO, shut down the tractor engine, remove the key, wait for all moving parts to come to a complete stop,
disconnect the PTO shaft from the tractor, then wait 5 minutes before moving or performing maintenance/inspection on
the chipper.
Never pry against the scroll weldment when removing the deflector or discharge chute, or at any other time. This will
cause damage to the machine.
Tools Needed:
• Two 1/2" Wrenches
Disassemble:
1. Disconnect the PTO Shaft.
2. Remove any material left in the Chipper Hopper.
3. Remove the two Bolts and Locknuts that secure the Discharge Chute
to the Chipper Basic Assembly with two 1/2" wrenches and then
remove the Discharge Chute (Figure 24).
4. Check to see if the Discharge Chute or Discharge opening is clogged.
If it is, clear it with a branch.
5. With a wooden stick, loosen and remove any material left in the
Chipping Chamber and make sure the Flywheel turns freely with the
stick.
Reassemble:
1. Position the Discharge Chute onto the Chipper Basic Assembly and
secure with two Bolts and Locknuts using two 1/2" wrenches.
2. Reconnect the PTO Shaft, start the Tractor engine and engage the
PTO; allowing the remaining material in the Chipping Chamber to
discharge.
3. If the Chipping Chamber doesn’t clear and the flywheel is still
jammed, repeat above process.
NOTE: Be certain the Flywheel turns freely before trying to process more material
into the Chipper Hopper.
Figure 24
Bolts and
Locknuts
Discharge
Chute

3-POINT HITCH Mighty Mac Gravity Self-Feeding CHIPPER
20
Chapter 4: Maintaining Your 3-POINT HITCH MIGHTY MAC GRAVITY SELF-FEEDING CHIPPER
This chapter covers regular maintenance procedures that will ensure the best performance and long life of your 3-POINT
HITCH MIGHTY MAC GRAVITY SELF-FEEDING CHIPPER.
Maintenance Kits and Accessories are available through our website at www.MacKissic.com.
Disengage PTO, shut down the tractor engine, remove the key, wait for all moving parts to come to a complete stop,
disconnect the PTO shaft from the tractor, then wait 5 minutes before moving or performing maintenance/inspection on
the chipper.
Regular Maintenance Check List
NOTE: Consider that the service intervals shown are the maximum under normal operating conditions. Increase frequencies under
extremely dirty or dusty conditions. See the Owner’s Manual that came with the Tractor and with the PTO Shaft for
Specific Tractor and PTO Shaft maintenance.
Procedure
Before
Each Use
Every 8-10
Hours
Every 18-20
Hours
Every 40
Hours
Check General Equipment Condition
▲
CheckthattheFlywheelturnsfreely(withalongstick
only)
▲
Visually inspect Knife for damage
▲
Check Knife and Wear Plate for Sharpness
▲
Check Knife and Wear Plate Attachment Screws
▲
Check Flywheel Bearing Collar Set Screws
▲
Check Knife to Wear Plate Gap
▲
Lubricate Flywheel Bearings
▲
Lubricate PTO Shaft Grease Fittings
▲
Lubricate PTO Sheave Bearings
▲
Check Belt Tension and Condition
1st time 1
hour
▲
Lubricate PTO Shaft Spline ends and center overlap
▲
Inspect or replace Drive Belt
▲