OPERATORS MANUAL
DECEMBER 2018
TABLE OF CONTENTS
SECTION DESCRIPTION PAGE
1
2
3
4
5
5.1
5.2
5.2.1
5.2.2
5.2.3
5.2.4
5.2.5
5.2.6
5.2.7
5.3
5.4
5.5
5.6
6
6.1
6.2
6.3
6.3.1
6.3.2
7
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
7.9
8
Introduction
Warranty
Predelivery
Components
Safety
Safety Alert Symbol And Signal Words
Operational Hazards
Replace Safety Signs
Prepare For Emergencies
Do Not allow Riders
Lower Operating Speed
Prevent Rollover
Avoid Power Lines And Underground Utilities
Avoid Loud Noise
Maintenance Hazards
Hazards From Modifying Equipment
Safety Warning Labels
Sign Off Form
Operation
Pre-Operation Checklist
Carbide Teeth Break In
Operation
Grinding A Stump
Storage
Routine Maintenance
Maintenance Intervals
Inspections
Throttle Inspection
Clutch Inspection
Rotate Cutting Teeth
Replace Cutting Teeth
Replace Tooth Holder
Lubrication
Check Belt
Troubleshooting
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2 | HOLT HGW13 Stump Grinder Operator’s Manual
1. INTRODUCTION
Thank you for purchasing a Holt Industrial HGW13 Stump
Grinder.
You must read, understand, and follow all instructions in this
manual before operating, adjusting or servicing this machine.
If you do not understand any part of this manual or you are
unsure about any aspect of this machine, contact Holt Industrial.
Information provided in this manual was current as of the issue
date.
Information furnished in this manual does not include all of the
details of design, production, or variations of equipment. It does
not cover all the possible contingencies, which may arise during
operation or maintenance.
Should special issues arise, or further information be desired,
contact your dealer.
This manual covers the Holt Industrial HGW13 Stump Grinder
and is provided to assist in the safe operation and maintenance
of the equipment.
There are three different types of labeling on this machine:
safety, informative and product labels.
Safety Labels are pictorial with a yellow background and
generally 2 panel. Top panel indicates the potential hazard
and the bottom panel indicates how to avoid the hazard.
Informative Labels are generally pictorial, have a white
background and can vary to the number of panels. The label
will illustrate the function of a feature and is accompanied
by detailed instructions in the owners manual, with the label
illustrated along side.
Product Labels contain product information such as model
number or serial number.
Equipment modications from original design and specications
without written permission are strictly prohibited.
Modications may compromise safe operation of machine,
subject users to serious injury or death and may void any
remaining warranty.
This operator’s manual does not replace, nor does its use
discharge the operator from observing all safety codes or
operating limitations as well as any applicable federal, state,
provincial or local regulations.
HOLT HGW13 Stump Grinder Operator’s Manual | 3
2. Warranty
This product is warranted to be free of defects in materials and
workmanship under normal use and service, for a period of one
year from the date of purchase, when operated and maintained
in accordance with the Operating and Maintenance Instructions
supplied with this unit. This warranty does not cover misuse or
negligence.
Under no circumstances will the manufacturer be liable for any
consequential damage or expense of any kind, including loss
of prots.
The manufacturer is not liable for the maintenance of the
product.
This warranty is extended only to the original purchaser.
Warranty is void if repairs are attempted by anyone other than
an Authorized Service Center.
If a difculty develops with the product, you should contact your
nearest Authorized Repair Center, or distributor. Only these
locations are authorized to make repairs to the product or affect
the replacement of defective parts, which will be done at no
charge within a reasonable time after the receipt of the product.
Units or parts should be returned at the customer’s expense to
the nearest repair location or Authorized Service Center. Pack
in a strong container and pad tightly to avoid damage. Damage
in-transit is not covered by warranty. Include original purchase
receipt with any claim (keeping a copy for your les).
Please note the following details and le this information in an
appropriate place.
Model Number: _____________________________________
S/N:_______________________________________________
Date of Purchase: ____________________________________
Owner’s Name______________________________________
The Manufacturer’s Liability is limited to repair of the product
and/or replacement of parts and is given to the purchaser in
lieu of all other remedies including incidental and consequential
charges. There are no warranties, expressed or implied other
than those specied herein. For the nearest Authorized Service
Center, call the manufacturer.
4 | HOLT HGW13 Stump Grinder Operator’s Manual
3. PREDELIVERY
This predelivery procedure must be performed and signed off
by a qualied Holt Industrial representative and Holt Industrial
trained owner, maintenance supervisor or operator at the time
of delivery and before going into service.
________________________________________________
Owner / Owner Representative
________________________________________________
Address
________________________________________________
________________________________________________
City, State/Province, Postal Code
________________________________________________
Phone Number
_________________________________________________
Holt Industrial Representative Signature
_________________________________________________
Date
Predelivery Inspection
X
Verify rotor turns freely.
Verify all fluids are at proper level.
Verify tires are properly inflated.
Lubricate all grease fittings.
Verify all fasteners are tight.
Verify all decals are installed.
Start engine and operate all functions to verify
operation. Stop engine.
________________________________________________
Holt Industrial Representative
________________________________________________
Phone Number
________________________________________________
VIN Number
________________________________________________
Delivery Date
The owner or owner representative is thoroughly trained on the
Holt Industrial HGW13 Stump Grinder. Predelivery inspection
has been performed. Safe operation, care, adjustments,
warranty policy and manuals for the HGW13 Stump Grinder
have been reviewed.
________________________________________________
Owner / Owner Representative Signature
________________________________________________
Date
HOLT HGW13 Stump Grinder Operator’s Manual | 5
4. Components
A. Rotor
B. Debris Guard
C. Engine
D. Safety Bar
E. Operator Station Handle
F. Wheel Lock
G. Belt Guard
H. Lift Handles
I. Wheel Lock Lever
J. Handle Height Lock
K. Engine Stop Button
B
E
D
C
F
A
J
K
6 | HOLT HGW13 Stump Grinder Operator’s Manual
G
H
I
H
5. Safety
5.1 Safety Alert Symbol And
Signal Words
You must read, understand and follow the instructions given
by the operating unit manufacturers, as well as the instructions
in this manual.
The safety information in this manual is denoted by the safety
alert symbol:
^
This symbol means ATTENTION! BECOME ALERT! YOUR
SAFETY IS INVOLVED!
The level of risk is indicated by the following signal words:
^ DANGER
DANGER - Indicates a hazardous
situation, which, if not avoided, WILL
result in death or serious injury.
5.2 Operational Hazards
California Proposition 65 Warning
Battery posts, terminals and related accessories contain
lead and lead compounds, chemicals known to the State of
California to cause cancer, birth defects and other reproductive
harm. Wash hands after handling.
^ WARNING
Prevent serious injury or death.
Read and understand this manual before
operating stump grinder.
Always stop engine and allow rotor to
stop before approaching rotor.
Never allow anyone near stump grinder
during operation.
Travel at a safe speed.
^ WARNING
WARNING - Indicates a hazardous
situation, which, if not avoided, COULD
result in death or serious injury.
^ CAUTION
CAUTION - Indicates a hazardous
situation, which, if not avoided, could
result in minor or moderate injury.
NOTICE
NOTICE - Indicates a situation that could
result in damage to the equipment or
other property.
^ WARNING
Prevent serious injury or death from
moving parts.
Moving parts can crush and dismember.
Do not operate without guards and
shields in place.
Stop engine before adjusting or
performing maintenance.
^ WARNING
Safely operate equipment.
Allow only properly trained and qualied
personnel to operate this equipment.
HOLT HGW13 Stump Grinder Operator’s Manual | 7
^ WARNING
5.2.1 Replace Safety Signs
Use stump grinder only for the designed
applications.
Any other use may result in personal
injury, damage to equipment and may
void the warranty.
^ WARNING
Prevent serious injury or death.
Engine exhaust contains carbon
monoxide. Carbon monoxide is an
odorless gas that can cause death.
Avoid any areas or actions that expose
you or others to carbon monoxide.
Never refuel a running engine or refuel
near ignition sources.
Carefully read all safety messages in this manual and on
equipment safety signs. Keep safety signs in good condition
and replace missing or damaged safety signs.
Replace missing or damaged safety signs.
Safety sign location are identied in Section 5.5 of this manual.
Replacement safety signs are available from your dealer.
5.2.2 Prepare For Emergencies
Be prepared in case of emergencies.
Keep a re extinguisher and rst aid kit close to the machine.
Keep emergency phone numbers close to your phone.
Know your address so emergency services can locate you if
an emergency arises.
New equipment components and repair parts must include the
current safety decal.
Learn how to properly operate equipment. NEVER operate or
work around this equipment without proper instruction, while
fatigued or under the inuence of alcohol, prescription or non-
prescription medication or if feeling ill.
Keep your equipment in proper working condition. Know the
regulations and laws that apply to you and your industry. This
manual is not to replace any regulations or laws.
Additional information may be found at:
www.asae.org or www.osha.gov.
If you do not understand any part of this manual, contact your
dealer.
8 | HOLT HGW13 Stump Grinder Operator’s Manual
5.2.3 Do Not Allow Riders
NEVER lift or carry anyone on stump grinder.
NEVER use stump grinder as a work platform.
NEVER allow passengers on stump grinder.
5.2.4 Lower Operating Speed
Keep rotor low and move at slow speeds on rough or uneven
terrain.
5.2.5 Prevent Rollover
5.3 Maintenance Hazards
The equipment may rollover, resulting in death or serious
injury. To help prevent rollover:
− Travel at a slow speed.
− Avoid sharp turns & sudden movement on slopes.
− Travel with rotor close to the ground.
− Avoid holes, ditches and other obstructions which
may cause equipment to rollover.
− Use caution when operating on slopes and do not
operate on excessively steep slopes.
5.2.6 Avoid Power Lines And
Underground Utilities
^ WARNING
Prevent electrocution.
Death or serious injury can result if
equipment comes near or contacts power
lines.
Electrocution can occur without direct
contact.
Have local utilities locate and mark under ground wires, cables,
pipelines and other hazards before grinding.
Before servicing, park machine on a rm and level surface, set
parking brake, chock wheels, and place a “Do Not Operate”
tag on engine controls. Read and understand this manual. If
you do not understand any part of this manual, contact your
dealer.
Always wear face and/or eye protection, safety shoes, and
other protective equipment appropriate for the job.
Always use Holt Industrial replacement parts.
^ WARNING
Moving parts can crush and cut.
Keep clear of moving components.
^ WARNING
Crushing and severing hazard.
Before performing inspections, service or
maintenance:
• Park machine on rm, level surface.
• Engage wheel lock.
• Turn engine off.
6.2.7 Avoid Loud Noise
^ WARNING
Prolonged exposure to loud noise can
cause impairment or loss of hearing.
Wear a suitable hearing protective device.
^ WARNING
Entanglement hazard.
Keep clear of moving components.
^ WARNING
Prevent serious injury or death.
Wear proper protective equipment
appropriate for the job.
HOLT HGW13 Stump Grinder Operator’s Manual | 9
5.4 Hazards From Modifying
Equipment
5.5 Safety Warning Labels
Do not make any alterations to the stump grinder. Altering may
cause equipment to be unsafe and may void the manufacturers’
warranty.
^ WARNING
To protect you and others against death
or serious injury, all labels shown must
be on stump grinder and must be legible.
If any of these labels are missing or
cannot be read, contact your dealer for
replacement labels.
10 | HOLT HGW13 Stump Grinder Operator’s Manual
A
Decal A: D003069
Decal B: MTB-052
B
HOLT HGW13 Stump Grinder Operator’s Manual | 11
Decal C: MTB-176
Never allow riders; especially children
on carrier or cutter.
cutting
E
F
D
C
12 | HOLT HGW13 Stump Grinder Operator’s Manual
E
G
Decal D: MTB-177
Decal F: MTB-178
Decal E: MTB-065
Decal G: MTB-185 Located Under Belt Guard
MTB-065
HOLT HGW13 Stump Grinder Operator’s Manual | 13
5.6 Sign Off Form
Holt Industrial follows the general safety standards specied by the American Society of Agricultural and Biological Engineers
(ASABE) and the Occupational Safety and Health Administration (OSHA). Anyone who will be using and/or maintaining the
stump grinder must read and clearly understand ALL safety, operational and maintenance information presented in this manual.
Do not use or allow anyone to use this stump grinder until such information has been reviewed. Annually review this information
before the season start-up. Make periodic reviews of safety and operation a standard practice for all of your equipment.
An untrained operator is unqualied to use this stump grinder.
A sign-off sheet is provided for your record keeping to show that all personnel who will be working with the equipment have read
and understand the information in the Operator’s Manual and have been instructed in the operation of the equipment.
Sign Off Form
Date Employee Signature Employer Signature
14 | HOLT HGW13 Stump Grinder Operator’s Manual
6. Operation
^ Keep bystanders, livestock, pets, etc away from work
area.
^ Always wear protective equipment appropriate for the job.
^ Do not operate, work on or around this machine while
under the influence of alcohol, drugs or if feeling ill.
^ Keep clear of moving machinery at all times.
^ Stop stump grinder engine before leaving operators area.
^ It is your responsibility to operate this equipment safely.
You must be familiar with the equipment and all safety
practices before use.
^ Do not allow untrained or unqualied people to operate
this equipment.
6.1 Pre-Operation Check List
Perform the following checks prior to operation.
• Review and understand this manual and engine operators
manual.
6.3 Operation
^ WARNING
Prevent serious injury or death.
Keep clear of moving machinery.
^ WARNING
Prevent serious injury or death.
Engine exhaust contains carbon
monoxide. Carbon monoxide is an
odorless gas that can cause death.
Avoid any areas or actions that expose
you or others to carbon monoxide.
^ WARNING
Wear an approved respirator (N95 Type
as a minimum).
• Verify safety decals are installed and legible. Replace if
damaged or missing.
• Verify that all hardware is tight.
• Verify that local utilities have marked all underground
utilities.
6.2 Carbide Teeth Break In
New carbide teeth are razor sharp and can chip and shatter
easily when they hit hard objects. Once the razor sharpness
has worn away, tips do not chip as easily. Observing these
precautions will extend the life of the carbide teeth and reduce
operating expenses.
Follow local, state and federal
regulations.
The health effects from exposure to wood
dust are due to chemicals in the wood or
chemical substances in the wood created
by bacteria, fungi, or molds.
^ WARNING
Never operate stump grinder when other
people are in the vicinity. Debris can be
thrown several feet from cutting area.
Keep all shields in place.
HOLT HGW13 Stump Grinder Operator’s Manual | 15
6.3.1 Grinding A Stump
^ WARNING
Prevent serious injury or death.
Keep clear of moving machinery.
1. Pull handle height lock (A) and adjust handle to a
comfortable level. Push lock in to engage in hole to lock
handle.
A
B
NOTICE
Grinding a stump with engine at less
than operating speed may result in clutch
damage and also void the warranty.
Safety bar (C) must be tight against
handle (D) and engine running at
operating speed (3600 rpm) when
grinding stump.
2. Start stump grinder engine. See OEM engine manual for
safety, prestart and operational information.
3. If the stump is on a grade, position stump grinder lower
on the grade with the cutting wheel on the stump grinder
higher up the grade.
4. Position stump grinder up to the front edge of the stump.
5. Verify stump grinder is positioned at the edge of the stump
that is closest to the stump grinder.
6. Position rotor close to, but not touching stump.
7. Pull wheel lock lever (B) to lock left wheel. Lever is shown
in the locked position. This will allow you to pivot stump
grinder while grinding stump.
16 | HOLT HGW13 Stump Grinder Operator’s Manual
8. Pull safety bar (C) tight against handle (D). This will
increase engine rpm to operating speed and engage rotor.
Releasing safety bar (C) will decrease engine speed and
disengage rotor.
D
C
9. Make the rst pass across front edge of stump, pivoting
the stump grinder from side to side in 3-6 inch passes.
10. Continue to take passes across the front edge of the
stump, taking 3-6 inches on each pass.
18. Follow the roots, taking as much of the larger surface
roots as possible. If these are not removed they can, over
time, protrude from the ground in areas where there is a
heavy freeze/thaw cycle.
19. Release safety bar (C) to disengage rotor.
20. Move stump grinder away from stump to a flat surface.
21. Stop stump grinder engine.
6.3.2 Storage
Pull handle lock (A) out and flip handle over for storage.
A
11. When ground level is reached, continue to grind below
the surface to the bottom of the stump where the roots
branch out.
12. Release safety bar (C) to decrease engine speed and
disengage rotor.
13. Release wheel lock and position the stump grinder beside
the new front edge of the stump.
14. Engage wheel lock.
15. Pull safety bar (C) against handle (D) to engage rotor.
This will increase engine rpm to operating speed and
engage rotor.
16. Make multiple passes over the front edge of the stump,
taking 3-6 inches on each pass.
17. Reposition stump grinder as needed until the entire stump
has been removed to below ground level.
HOLT HGW13 Stump Grinder Operator’s Manual | 17
7. Routine Maintenance
7.1 Maintenance Intervals
Item
Verify emergency stop is functioning properly.
With engine stopped, verify throttle is fully open when safety bar is pulled tight
against handle.
Check cutting teeth for wear. Rotate or replace cutting teeth as necessary.
Check engine air filter. Clean or replace as necessary.
Lubricate pivot point grease fittings.
Lubricate rotor bearings
Check rotor bearings for side-to-side and up/down movement. Replace
bearings if movement is found.
Check drive belt condition and tension.
Change engine air filter.
Change engine oil.
^ WARNING
Moving parts can crush and cut.
Keep clear of moving components.
Stop engine before performing
inspections or maintenance.
7.3 Throttle Inspection
With engine stopped, pull safety bar tight against handle and
verify throttle (A) is against stop (B). If throttle is not against
stop, loosen clamp screw (C) and adjust throttle cable case as
necessary. Tighten screw (C) and re-check. Throttle (A) must
be against stop (B) and when safety bar is tight against handle.
Engine must be running at operating speed (3600 rpm) when
grinding a stump.
Daily
Before
Use
●
●
Every
4
Hours
●
●
Every
30
Hours
●
●
Weekly
●
Every
100
Hours
●
●
●
^ WARNING
Prevent serious injury or death.
Wear proper protective equipment
appropriate for the job.
7.2 Inspections
Inspect the unit for worn or damaged parts. Repair or replace
parts as needed.
18 | HOLT HGW13 Stump Grinder Operator’s Manual
7.4 Clutch Inspection
Inspect clutch between each use.
NOTICE
Prevent clutch damage.
Engine must be running at operating
speed (3600 rpm) when grinding a
stump.
1. Park grinder on a level surface.
2. Shut off engine.
3. Inspect clutch bearing seal area (A). Grease on outside
of seal indicates excessive heat. Discoloration in areas
(B) also indicates excessive heat. Excessive heat is a result of clutch slippage. This is normally due to grinding a
stump at less that operating speed. Verify engine throttle
is properly adjusted so engine runs at operating speed
(3600 rpm) when safety bar is tight against handle.
4. Inspect pulley grooves. Wear in the bottom of pulley
grooves (C) indicates that belt is worn out and must be
replaced. Excessive belt wear is a result of belt slippage.
This is normally due to belt not being tight enough and will
damage the pulley as it must run cool to work properly.
HOLT HGW13 Stump Grinder Operator’s Manual | 19
7.5 Rotate Cutting Teeth
7.6 Replace Cutting Teeth
Check cutting teeth every 4 hours of use. Keep cutting teeth in
good condition. Unit will cut faster and remaining teeth will last
longer if broken or worn teeth are replaced.
Each tooth can be rotated up to two times from its original
position before replacement is necessary.
1. Park stump grinder on a level surface.
2. Shut off engine.
3. Inspect teeth for wear on top edge. Once top edge is
worn, rotate tooth so a new edge is on top (cutting) edge.
4. Loosen locknut (A) on tooth (B) and rotate tooth 1/3 turn.
Flat shoulder on tooth will t against shoulder (C) on tooth
holder.
5. Tighten locknut (A) to 65 lb/ft (88
Nm) of torque.
1. Park stump grinder on a level surface.
2. Shut off engine.
3. Inspect cutting teeth (B) for damage and wear. Replace
individual teeth as needed.
4. Remove locknut (A) and spacer from tooth (B). Install new
tooth. Flat shoulder on tooth will t against shoulder (C)
on tooth holder.
5. Install spacer and locknut. Tighten locknut (A) to 65 lb/ft
(88 Nm) of torque.
A
C
B
A
C
B
20 | HOLT HGW13 Stump Grinder Operator’s Manual
7.7 Replace Tooth Holder
1. Park stump grinder on a level surface.
2. Lower rotor to the ground.
3. Shut off engine and remove key.
4. Inspect tooth holders (A) for damage and wear. Replace
individual tooth holders as needed.
5. Remove tooth from tooth holder.
6. Remove mounting hardware on tooth holders. Install new
tooth holder and tighten mounting hardware.
7. Install tooth into new tooth holder.
8. Tighten tooth locknut to 65 lb/ft (88 Nm) of torque.
A
A
A
7.8 Lubrication - Every 30 Hours
1. Lubricate rotor bearings (A).
B
3. Lubricate axles (C).
A
2. Lubricate pivot pin (B).
C
HOLT HGW13 Stump Grinder Operator’s Manual | 21
7.9 Check Belt
Remove belt guard and inspect belt (A) for proper tension,
wear, damage and correct alignment. Replace belt if worn or
if belt is damaged. Check belt alignment. Engine pulley and
rotor pulley must be aligned or belt will wear quickly. If not
aligned, adjust engine pulley and/or rotor pulley.
A
Belt deection (B) should be 0.5 in. (13 mm) at 3.0 lbs of
force for a used belt or 4.25 lbs of force for a new belt.
To adjust belt tension, loosen engine mounting bolts. Loosen
jam nut (C). Turn adjustment bolt (D) clockwise to tighten belt
to proper tension. Tighten jam nut (C) and engine mounting
bolts.
Install belt guard. Do not operate stump grinder with belt guard
removed.
D
C
B
22 | HOLT HGW13 Stump Grinder Operator’s Manual
8. Troubleshooting
Problem Probable Cause Solution
Rotor does not spin. Rotor jammed. Lock out power and clear debris from
rotor.
Drive belt loose. Tighten drive belt.
Rotor rotates slow or sluggish. Drive belt loose. Tighten drive belt.
Excessive vibration. Debris lodged in rotor. Lock out power and clear debris from
rotor.
Smoke emitting from engine exhaust
pipe.
Dirty or clogged engine air lter. Change engine air lter.
HOLT HGW13 Stump Grinder Operator’s Manual | 23
Wallenstein, Ontario Canada
Phone - 844.444.4658
holtindustrial.com
24 | HOLT HGW13 Stump Grinder Operator’s Manual
Holt Industrial
4575 Powell Rd.,
N0B 2S0
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