HOLT HGW30 User manual

2| HOLT HGW30 Stump Grinder Operator’s Manual
TABLE OF CONTENTS
SECTION DESCRIPTION PAGE
1
2
3
4
5
6
6.1
6.2
6.2.1
6.2.2
6.2.3
6.2.4
6.2.5
6.2.6
6.2.7
6.2.8
6.2.9
6.3
6.4
6.5
6.6
7
7.1
7.2
7.3
7.3.1
7.3.2
8
8.1
8.2
8.3
8.4
8.5
8.6
9
Introduction
Warranty
Predelivery
Components
Specications
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
Raised Rotor
Avoid High Pressure Fluids
Maintenance Hazards
Hazards From Modifying Equipment
Safety Warning Labels
Sign Off Form
Operation
Pre-Operation Checklist
Carbide Teeth Break In
Operation
Operator Controls
Grinding A Stump
Routine Maintenance
Maintenance Intervals
Inspections
Rotate Cutting Teeth
Replace Cutting Teeth
Replace Tooth Holder
Lubrication
Troubleshooting
............
............
............
............
............
............
............
............
............
............
............
............
............
............
............
............
............
............
............
............
............
............
............
............
............
............
............
............
............
............
............
............
............
............
.............
3
4
5
6
7
8
8
8
9
9
9
9
9
10
10
10
10
11
11
12
14
15
15
15
15
16
16
17
17
17
17
18
18
19
20

HOLT HGW30 Stump Grinder Operator’s Manual | 3
1. INTRODUCTION
Thank you for purchasing a Holt Industrial HGW30 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 HGW30 Stump Grinder
and is provided to assist in the safe operation and maintenance
of the equipment.
Equipment modications from original design and specications
without written permission are strictly prohibited.
Modications 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.
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.

4| HOLT HGW30 Stump Grinder Operator’s Manual
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
prots.
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 difculty 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).
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 specied herein. For the nearest Authorized Service
Center, call the manufacturer.
Please note the following details and le this information in an
appropriate place.
Model Number: _____________________________________
S/N:_______________________________________________
Date of Purchase: ____________________________________
Owner’s Name______________________________________

HOLT HGW30 Stump Grinder Operator’s Manual | 5
3. PREDELIVERY
This predelivery procedure must be performed and signed off
by a qualied 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
_________________________________________________
Phone Number
_________________________________________________
VIN Number
_________________________________________________
Delivery Date
The owner or owner representative is thoroughly trained on the
Holt Industrial HGW30 Stump Grinder. Predelivery inspection
has been performed. Safe operation, care, adjustments,
warranty policy and manuals for the HGW30 Stump Grinder
have been reviewed.
_________________________________________________
Owner / Owner Representative Signature
_________________________________________________
Date
_________________________________________________
Holt Industrial Representative Signature
_________________________________________________
Date
XPredelivery Inspection
Verify rotor turns freely.
Verify all uids are at proper level.
Verify tires are properly inated.
Verify all wheel lugs are tight.
Lubricate all grease ttings.
Verify all fasteners are tight.
Verify all decals are in installed.
Start engine and operate all functions to verify opera-
tion. Stop engine.
Check hoses and ttings for leaks.

6| HOLT HGW30 Stump Grinder Operator’s Manual
4. Components
A. Rotor Raise/Lower Hydraulic Cylinder
B. Hydraulic Oil Reservoir Fill
C. Hydraulic Oil Filter
D. Hydraulic Oil Reservoir
E. Traction Control
F. Swing And Drive Speed Control
G. Engine
H. Engine Fuel Tank
I. Grinding & Driving Controls
J. Rotor Control
K. Rotor Swing Hydraulic Cylinder
L. Debris Guard
M. Hydraulic Motor
N. Rotor
A
BC
D
EF
G
H
I
J
K
L
N
M

HOLT HGW30 Stump Grinder Operator’s Manual | 7
5. Specifications
Engine ................................................................30 hp / 999cc
Rotor Size.......................................................18 in. (457 mm)
Number Of Teeth................................................................. 24
Rotor Speed ........................................................... 1800 RPM
Cutting Height Above Ground.........................24 in. (610 mm)
Cutting Depth Below Ground..........................12 in. (305 mm)
Maximum Cutting Depth Per Pass .....................3 in. (76 mm)
Maximum Horizontal Cut ..............................46 in. (1168 mm)
Swing Arc ...........................................................................85°
Input Speed ............................................................ 3300 RPM
Unit Weight.................................................. 1500 lbs (680 kg)
Width ..............................................................35 in. (890 mm)
Length.........................................................105 in. (2667 mm)
Hydraulic Oil ...................................................... ISO 46 Rated
Maximum Hydraulic Oil Temperature At 100° F (38° C) Ambient
Conditions........................................................180° F (82° C)

8| HOLT HGW30 Stump Grinder Operator’s Manual
6. Safety
6.1 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.
^ 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.
6.2 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
Prevent serious injury or death from
moving parts.
Moving parts can crush and dismember.
Do not operate without guards and
shields in place.
Lockout engine controls before adjusting
or performing maintenance.
^ WARNING
Safely operate equipment.
Allow only properly trained and qualied
personnel to operate this equipment.

HOLT HGW30 Stump Grinder Operator’s Manual | 9
^ WARNING
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.
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 inuence 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.
6.2.1 Replace Safety Signs
Replace missing or damaged safety signs.
Safety sign location are identied in Section 5.5 of this manual.
Replacement safety signs are available from your dealer.
6.2.2 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.
6.2.3 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.
6.2.4 Lower Operating Speed
Keep rotor low and move at slow speeds on rough or uneven
terrain.
6.2.5 Prevent Rollover
The equipment may rollover, resulting in death or serious
injury. To help prevent rollover:
−Travel at a slow speed.

10 | HOLT HGW30 Stump Grinder Operator’s Manual
−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.
6.2.6 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.
6.2.7 Avoid Load Noise
^ WARNING
Prolonged exposure to loud noise can
cause impairment or loss of hearing.
Wear a suitable hearing protective device.
6.2.8 Raised Rotor
^ WARNING
Crushing hazard.
Raised, unsupported rotor can fall,
resulting in death or serious injury.
Never enter the area under a raised rotor.
A raised rotor can lower unexpectedly, resulting in death or
serious injury.
NEVER enter area under a raised rotor.
Lower rotor to ground, engage parking brake, shut off engine
and lockout engine controls before servicing.
6.2.9 Avoid High Pressure Fluids
^ WARNING
Pressurized uids can penetrate the skin.
Hydraulic hoses can fail from age,
damage and exposure.
Use body and face protection while
searching for leaks. A tiny, almost
invisible leak can penetrate the skin,
thereby requiring immediate medical
attention.
Use wood or cardboard to detect
hydraulic leaks, never use your hands.
Escaping uid under pressure can penetrate the skin causing
serious injury.
Prevent the hazard by relieving pressure before connecting or
disconnecting hydraulic lines. Verify all connections are tight
before applying pressure.
Search for leaks with a piece of cardboard or wood.
Protect hands and body from high pressure uids. If an
accident occurs, see a doctor immediately. Any uid injected
into the skin must be surgically removed within a few hours or
serious infection may result.
Doctors unfamiliar with this type of injury should reference a
knowledgeable medical source.

HOLT HGW30 Stump Grinder Operator’s Manual | 11
6.3 Maintenance Hazards
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 parking brake.
• Turn engine off and lockout engine
controls.
^ WARNING
Entanglement hazard.
Keep clear of moving components.
^ WARNING
Burn hazard.
Hot and high pressure hydraulic oil.
Allow oil to cool before servicing.
^ WARNING
Prevent serious injury or death.
Wear proper protective equipment
appropriate for the job.
6.4 Hazards From Modifying Equipment
Do not make any alterations to the stump grinder. Altering
may cause equipment to be unsafe and may void the
manufacturers’ warranty.

12 | HOLT HGW30 Stump Grinder Operator’s Manual
A
A
C
B
D
6.5 Safety Warning Labels
^ 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.

HOLT HGW30 Stump Grinder Operator’s Manual | 13
Decal C:
Caution: Body crush area. Be aware of and stay clear of this
area during operation.
Decal D:
Caution: Read and understand all safety and operating
instructions in the manual. Read and understand all safety
labels located on the machine.
Decal A:
Caution: Flying objects. Be aware of and stay clear of material
discharge area. Machine can expel wood chips fast enough
to cause injury.
Decal B:
Caution: Hydraulic uid under pressure, do not check for
leaks with your hand or ngers. Serious injury may result.

14 | HOLT HGW30 Stump Grinder Operator’s Manual
6.6 Sign Off Form
Holt Industrial follows the general safety standards specied 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 unqualied 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 Employers Signature

HOLT HGW30 Stump Grinder Operator’s Manual | 15
7. 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 inuence 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 unqualied people to operate
this equipment.
7.1 Pre-Operation Check List
Perform the following checks prior to operation.
• Review and understand this manual and engine operators
manual.
• Verify safety decals are installed and legible. Replace if
damaged or missing.
• Verify that all hardware is tight.
• Inspect hoses and ttings for wear, damage and leaks.
Replace damaged or leaking hoses before use.
• Verify hydraulic oil is at full level on sight glass
• Verify that local utilities have marked all underground
utilities.
7.2 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.
7.3 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).
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.

16 | HOLT HGW30 Stump Grinder Operator’s Manual
7.3.1 Operator Controls
A
BC
DEFG
A. Rotor Engage/Disengage
B. Traction Control
C. Swing & Drive Speed Control
D. Rotor Swing Control
E. Rotor Lift Control
F. Steering Control
G. Drive Control
7.3.2 Grinding A Stump
^ WARNING
Prevent serious injury or death.
Keep clear of moving machinery.
1. Start stump grinder engine. See OEM engine manual for
safety, prestart and operational information.
2. Set engine speed at high idle.
3. Adjust stump grinder swing speed. Rotate swing & drive
speed control (C) counter clockwise to slow setting. It
is recommended to start at the slow setting and adjust
speed up as desired.
4. Rotate traction control (B) fully clockwise to lock drive
wheels together. Rotate control counter clockwise to allow
steering.
5. 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.
6. Position stump grinder up to the front edge of the stump
using levers (F) and (G).
7. Check position of the stump grinder to the stump. Verify
stump grinder is positioned at the edge of the stump that
is closest to the stump grinder.
8. Verify rotor is close to, but not touching stump. Adjust
rotor height with lift control lever (E).
9. Engage rotor with lever (A).
10. Use lift lever (E) and swing lever (D) to direct the rotor.
Make the rst pass across front edge of stump, moving
the cutting wheel from side to side in 3-6 inch passes.
11. Continue to take passes across the front edge of the
stump, taking 3-6 inches on each pass.
12. When ground level is reached, continue to grind up to 12
in. (305 mm) below the surface to the bottom of the stump
where the roots branch out.
13. Lift rotor and swing it to right or left side. Back the stump
grinder up slightly to position the stump grinder beside the
new front edge of the stump.
14. Make multiple passes over the front edge of the stump,
taking 3-6 inches on each pass.
15. Reposition stump grinder as needed until the entire stump
has been removed to below ground level.
16. 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.
17. Move stump grinder away from stump to a at surface.
18. Set engine speed at low idle.
19. Stop stump grinder engine.

HOLT HGW30 Stump Grinder Operator’s Manual | 17
8. Routine Maintenance
8.1 Maintenance Intervals
^ WARNING
Moving parts can crush and cut.
Keep clear of moving components.
Lockout operating engine controls before
performing inspections or maintenance.
^ WARNING
Prevent serious injury or death.
Wear proper protective equipment
appropriate for the job.
8.2 Inspections
Check hydraulic hoses and ttings daily for leaks. Replace
worn or damaged parts.
Inspect the unit for any damage. Repair or replace parts as
needed.
Item
Daily
Before
Use
Every
4
Hours
Every
30
Hours
Weekly
Every
100
Hours
Every
200
Hours
Every
500
Hours
Every
2000
Hours
Check hoses and fittings for leaks. ●
Check cutting teeth for wear. Rotate or replace
cutting teeth as necessary. ●
Lubricate pivot point grease fittings. ●
Check rotor bearings for side-to-side and up/
down movement. Replace bearing if movement
is found.
●
Change engine oil filter. ●
Change engine air filter. ●
Change engine oil and filter. ●
Change hydraulic oil filter. ●
Change hydraulic oil and filter. ●
8.3 Rotate 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. Lower rotor to the ground.
3. Shut off engine and lockout engine controls.
4. Inspect teeth for wear on top edge. Once top edge is
worn, rotate tooth so a new edge is on top (cutting) edge.

18 | HOLT HGW30 Stump Grinder Operator’s Manual
5. Loosen locknut (A) on tooth (B) and rotate tooth 1/3 turn.
Flat shoulder on tooth will t against shoulder (C) on tooth
holder.
6. Tighten locknut (A).
A
B
C
8.4 Replace Cutting Teeth
1. Park stump grinder on a level surface.
2. Lower rotor to the ground.
3. Shut off engine and remove key.
4. Inspect cutting teeth (B) for damage and wear. Replace
individual teeth as needed.
5. Remove locknut (A) and spacer from tooth (B). Install new
tooth. Flat shoulder on tooth will t against shoulder (C)
on tooth holder.
6. Install spacer and locknut. Tighten locknut (A).
A
B
C
8.5 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.

HOLT HGW30 Stump Grinder Operator’s Manual | 19
A
A
8.6 Lubrication
1. Lubricate swing pivot pins (A), (B), (C) and base end pin
of cylinder (D) every 30 hours.
2. Lubricate raise/lower pivot pin (E) and cylinder pins (F)
and (G) every 30 hours.
A
B
C
E
F
G
D
3. Lubricate axle king pins (H), tie rod pins (I) and steering
cylinder pins (J) every 30 hours.
J
H
I
4. Lubricate axle pivot pin (K) every 30 hours.
K
HI
J

20 | HOLT HGW30 Stump Grinder Operator’s Manual
Problem Probable Cause Solution
Rotor does not spin. Rotor jammed. Lock out power and clear debris from
rotor.
Low hydraulic oil level. Check hydraulic oil level. Add if neces-
sary.
Low hydraulic oil ow. Have a qualied hydraulic technician
check hydraulic oil ow.
Rotor rotates slow or sluggish. Low hydraulic oil level. Check hydraulic oil level. Add if neces-
sary.
Oil hydraulic lter plugged. Replace hydraulic oil lter.
Relief valve not set properly. Have a qualied hydraulic technician
set relief valve.
Low hydraulic oil ow. Have a qualied hydraulic technician
check hydraulic oil ow.
Excessive vibration. Insufcient hydraulic pressure. Check hydraulic oil level. Add as
needed.
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.
9. Troubleshooting
Holt Industrial
4575 Powell Rd.,
Wallenstein, Ontario Canada
N0B 2S0
Phone - 844.444.4658
holtindustrial.com