Technical Manual
4325163-Rev B
HoverKing
32251 – 20 Inch (50.8 cm) HoverKing
32252 – 20 Inch (50.8 cm) Metal Blade Kit
32253 – 20 Inch (50.8 cm) Plastic Blade Kit
32254 – 20 Inch (50.8 cm) String Cutter Kit
32255 – 20 Inch (50.8 cm) Handle Extension Accessory
32257 – 16 Inch (40.6 cm) HoverKing
32258 – 16 Inch (40.6 cm) Metal Blade Kit
32259 – 16 Inch (40.6 cm) Plastic Blade Kit
32260 – 16 Inch (40.6 cm) String Cutter Kit
32261 – 16 Inch (40.6 cm) Handle Extension Accessory
32256 – Wheel Kit
™
WARNING
Warning: If incorrectly used, this machine can
cause severe injury. Those who use and maintain
this machine should be trained in its proper use,
warned of its dangers, and must read the entire
manual before attempting to set up, operate, adjust,
or service the machine.
GB
FOREWORD
This manual contains safety, operating, adjustment,
maintenance, troubleshooting instructions and parts list
for your new Jacobsen machine. This manual should be
stored with the equipment for reference during operation.
The serial plate is located on the deck housing. Jacobsen
recommends you record these numbers below for easy
reference.
Before you operate your machine, you and each operator
you employ should read the manual carefully in its
entirety. By following the safety, operating and
maintenance instructions, you will prolong the life of your
equipment and maintain its maximum efficiency.
If additional information is needed, contact your
Jacobsen Dealer.
A Textron Company
CHARLOTTE NC PRODUCT OF U.S.A.
®
Suggested Stocking Guide
To Keep your Equipment fully operational and productive, Jacobsen suggests you maintain a stock of the more
commonly used maintenance items. We have included part numbers for additional support materials and training aids.
To order any of the following material:
1. Write your full name and complete address on your
order form.
2. Explain where and how to make shipment:
❑ UPS ❑ Regular Mail
❑ Overnight ❑ 2nd Day
3. Order by the quantity desired, the part number, and
the description of the part.
4. Send or bring the order to your authorized Jacobsen
Dealer.
Service Parts
Qty. Part No. Description Qty. Part No. Description
4325116 Metal Blade (Package of 3) 4325134 1/2” HOC Spacer
4325126 Plastic Blade (Package of 6) 4325117 Blade Bolt, Metal Blade (Black)
4325146 String Cutter (Package of 50) 4325126 Blade Bolt, Plastic Blade (Silver)
4325118 20 Inch (508 mm) Blade Disk Washer
4325148 16 Inch (406 mm) Blade Disk Washer
Service Support Material
Qty. Part No. Description
4325163 Technical Manual
© 2015, Jacobsen, A Textron Company/Textron Innovations Inc.
“All rights reserved, including the right to reproduce this material
or portions thereof in any form.”
Qty. Part No. Description
Proposition 65 Warning
This product contains or emits
chemicals known to State of California
to cause cancer and birth defects or
other reproductive harm.
2
LITHO IN U.S.A. 7-2015
Table of Contents
Introduction
1.1 Important............................................................................. 1
1.2 Product Identification ..........................................................2
1.3 Serial Number .....................................................................2
1.4 Guidelines for the Disposal of Scrap Products ...................3
Safety
2.1 How to Operate Safely........................................................ 4
Specifications
3.1 Engine Specifications..........................................................8
3.2 Dimensions and Weights ....................................................9
3.3 Cutting Unit Specification.................................................. 11
3.4 Recommended Lubricants ................................................11
3.5 Accessories.......................................................................11
3.6 Support Literature .............................................................12
Decals
4.1 Safety Decals.................................................................... 13
Set-up
5.1 General .............................................................................14
5.2 Initial Inspection ................................................................14
5.3 Engine Oil .........................................................................14
5.4 Handle Assembly ..............................................................15
5.5 Handle Mounting Holes.....................................................15
5.6 Blade Disk Torque ............................................................15
Controls
6.1 Handle Controls ................................................................16
6.2 Engine Controls ................................................................17
Operation
7.1 Daily Inspection.................................................................19
7.2 OPC System .....................................................................19
7.3 Operating Procedure.........................................................20
7.4 Starting The Engine ..........................................................21
7.5 To Stop The Engine..........................................................22
7.6 Mowing..............................................................................22
Maintenance and Lubrication Charts
8.1 Maintenance Chart............................................................23
Maintenance
9.1 General Precautions .........................................................24
9.2 Engine...............................................................................24
9.3 Engine Oil .........................................................................25
9.4 Engine Air Filter ................................................................25
9.5 Fuel ...................................................................................26
9.6 Engine Exhaust.................................................................26
9.7 Inspecting Cutter Disk.......................................................27
9.8 Care and Cleaning ............................................................28
9.9 Mower Storage..................................................................29
Adjustments
10.1 General Precautions .......................................................30
10.2 Height of Cut (HOC)........................................................30
10.3 Bail Cable Adjustment (20 inch Mowers) ........................31
10.4 Torque Specification .......................................................32
Problem Solving
11.1 General ...........................................................................33
Notes
Parts List
13.1 How To Use The Parts Catalog ......................................36
13.2 To Order Parts ................................................................36
13.3 Parts Catalog Table of Contents.....................................36
1 INTRODUCTION
1Introduction
1.1 IMPORTANT______________________________________________________________
The Jacobsen HoverKing is a walk behind rotary mower.
If you follow all instructions in this manual, you increase the life of your mower and keep its maximum performance. The
adjustments and maintenance must always be done by an approved technician.
IMPORTANT: Do the maintenance included in this manual to make sure that the quality of cut is kept at a high level.
This SAFETY, OPERATION AND MAINTENANCE MANUAL is part of the mower and must stay with the mower always.
Suppliers of both original and used mowers need to keep the documentation that comes with the mower.
You must use the mower to cut the grass and not for any other purpose. Compliance with the conditions or operation,
service and repair specified by the manufacturer, are understood to be part of the correct use.
ALL operators MUST read through this manual and understand the Safety Instructions, controls, lubrication and
maintenance procedures.
Make sure that you obey all safety and road traffic regulations.
You must not make any changes to the mower that the manufacturer does not approve. This type of change can
release the manufacturer from the liability for any damage or injury.
When you discard worn parts, know the environmental result and use the systems available in the country where the
mower is used. When the mower is at its end of life, there are guidelines in this manual for the removal of the mower
from use.
Use only Jacobsen approved parts.
2006/42/EC
The instructions recorded here are the original instructions confirmed by Jacobsen, A Textron Company.
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INTRODUCTION 1
1.2 PRODUCT IDENTIFICATION _________________________________________________
Mower Serial number plate
The serial number plate is found on the deck housing near the air filter.
®
A Textron Company
CHARLOTTE NC PRODUCT OF U.S.A.
1.3 SERIAL NUMBER__________________________________________________________
Record the mower and engine numbers shown below:
Mower Number:_________________________
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1 INTRODUCTION
1.4 GUIDELINES FOR THE DISPOSAL OF SCRAP PRODUCTS _______________________
1.4.1 DURING SERVICE LIFE ____________________________________________________
The used oil is hazardous material. Follow the recommended procedures for their safe removal.
If a fluid leaks, contain the spill to make sure that the leak does not flow into the ground or drainage system. Follow the
local laws to make sure that leaks are controlled safely.
The maintenance procedures in this manual make sure that the damage that the mower can cause in the local
environment is controlled safely.
Take these actions after the mower complete its full service life.
1.4.2 END OF SERVICE LIFE _____________________________________________________
Use these guidelines with applicable Health, Safety and Environmental laws. Always use the approved local waste
disposal and agencies for recycled materials.
• Park the mower in a location to use all of the necessary lifting equipment.
• Use the correct tools and Personal Protective Equipment (PPE) and take instruction from the technical manuals
applicable to the mower.
• Remove and keep correctly
1. Fuel
2. Engine Oil
Disassemble the structure of the mower and refer to the technical manuals. Give attention to parts that have
mechanical pressure or tension applied to the part in the mower, including springs.
• Separate items that continue to have service life and returned to storage.
• Separate items that are worn into the material groups and removed according to the agencies for the recycled
materials that are available. Common types are as shown:
• Steel
• Non ferrous metals
• Aluminum
• Brass
• Copper
• Plastic Materials
• Identified
• Can be recycled
• Can not be recycled
• Not Identified
• Rubber
• Electrical and Electronic Components
• Add items that can not be easily separated into different materials to the “General discarded materials” area.
• Do not burn the discarded materials
Change the mower records to show that the mower is not in service and is discarded. Supply this serial number to
Jacobsen Warranty Department to close their records.
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SAFETY 2
2Safety
2.1 HOW TO OPERATE SAFELY ______________________________________________________
!
WARNING
EQUIPMENT OPERATED INCORRECTLY OR WITHOUT TRAINING CAN BE DANGEROUS.
Know the location and correct operation of controls. Operators without experience must receive instruction from
another person that knows the correct operation of the equipment before you operate the mower.
Only use parts, accessories and attachments approved by Jacobsen.
2.1.1 SAFE OPERATION
a Read the Operator’s Manual and other training material. If the operator or technician can not read this manual,
the owner is responsible to describe this material to the operators and technicians. Manuals in additional
languages may be available on the Jacobsen or RansomesJacobsen website.
a Read all of the instructions for this mower carefully. Know the controls and the correct operation of the
equipment.
b Children or persons who do not understand these instructions must not use the mower. The local regulations can
limit the age of the operator.
c Never use a mower near persons, including children or animals.
d Remember that the operator or owner is responsible for accidents or hazards that occur to other persons or their
property.
e Never allow persons to operate or service the mower or its attachments without correct instructions.
f Do not operate equipment while tired, sick or after you use alcohol or drugs.
2.1.2 PREPARATION
a When you operate the mower, wear correct clothing, slip resistant work shoes or boots, work gloves, hard hat,
safety glasses and hearing protection. Long hair, loose clothing or jewelry can be caught in moving parts.
b Do not operate the equipment with the OPC System disconnected or the system does not operate correctly. Do
not disconnect or prevent the operation of any switch.
c Never operate equipment that is not in correct order or without decals, guards, shields, deflectors or other
protective devices fastened.
d Inspect the mower before you operate the mower. Check the engine oil level. Fuel is flammable. Use caution
when you add the fuel to the mower.
e Operate the mower in daylight or in good artificial light. Use caution when you operate the mower during bad
weather. Never operate the mower with lightning in the area.
f Inspect the area to select the accessories and attachments that are needed to correctly and safely do the job.
Only use parts, accessories and attachments approved by Jacobsen.
g Be careful of holes in the terrain and other hazards that are not visible.
h Inspect the area where the equipment is operated. Remove all objects you can find before you operate. Be
careful of obstructions above the ground (low tree limbs, electrical wires) and also underground obstacles
(sprinklers, pipes, tree roots). Enter a new area carefully. Look for possible hazards.
i Inspect the cutting system before you start the mower. Make sure the blades are free to rotate.
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2 SAFETY
2.1.3 OPERATION
a Never operate the engine without enough ventilation or in an enclosed area. The carbon monoxide in the exhaust
fumes can increase to dangerous levels.
b Keep other persons or animals away from the mower.
c Only start the engine with the operator in the locations indicated. Never start the engine with persons near the
mower.
d Keep your hands and feet away from the cutting blades.
e Do not use on the slopes greater than the safe slope limit for the equipment.
f To guard against loss of control:
– Operate the mower across the face (horizontally), but not up and down on the face of slopes (vertically).
– Do not start or stop suddenly on slopes.
– Decrease the speed when you operate on slopes or when you must turn. Use caution when you change
direction. Turf condition can change the mower stability.
– Use caution when you operate the mower near drop-offs, ditches or embankments.
– Be careful of holes in the terrain and other hazards that are not visible.
g Always operate at speeds that allow you to have complete control of the machine. Make sure of your footing keep
a tight grip on the handle and walk. Never run when you operate the mower.
h Use caution when you go near corners, trees or other objects that can prevent a clear view.
i Before you move across or operate on the paths or roads, release the OPC handle and lift the mower. Look for
traffic.
j Stop the engine when the mower is on any surface that is not grass.
k Do not release the cut grass in the direction of persons or allow persons near the mower while in operation.
l Do not operate the mower with damaged guards or without safety devices in position.
m Do not change the engine governor setting or over-speed the engine. Never change or tamper with adjusters that
are closed with a seal for the engine speed control.
n Before you leave the mower, for any reason:
– Release the OPC handle to stop the engine and allow the mower to settle to the ground.
o When you hit an object or mower starts to cause the vibration that is not normal, inspect the mower for damage
and make repairs.
p Do not use this equipment for uses that the mower was not made for.
2.1.4 SAFE HANDLING OF FUELS
a The fuel and the fuel vapors are flammable. Use caution when you add the fuel to the mower. The fuel vapors
can cause an explosion.
b Never use the containers that are not approved to keep or transfer fuel.
c Never keep the mower or fuel containers near an open flame or any device that can cause the ignition of fuel or
fuel vapors.
d Never fill the fuel containers inside a vehicle or on a truck or trailer with a plastic liner. Always put the fuel
container on the ground away from your vehicle before you fill the container.
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SAFETY 2
e Refuel the mower before you start the engine. When the engine is in operation or while the engine is hot, never
remove the fuel cap or add fuel to the mower.
f Refuel outdoors only and do not smoke when you add fuel. Extinguish all types of ignition.
g The fuel nozzle must touch the rim of the fuel tank when you add fuel to the mower. Do not use a device to lock
the fuel nozzle in the open position.
h Do not over fill the fuel tank. Leave at least 1 inch (25 mm) below the filler neck.
i Always tighten the fuel tank cap and container cap after you add fuel.
j If the fuel spills on your clothing, change your clothing immediately.
2.1.5 MAINTENANCE AND STORAGE
a Before you clean, adjust or repair this equipment, stop the engine and disconnect the spark plug wire. Keep the
wire away from the plug to prevent the engine to start.
b Make sure the mower is stored on a solid and level surface.
c Never allow persons to service the mower or its attachments without correct instructions.
d When you put the mower on a trailer or put the mower in storage, close the fuel valve. Do not keep fuel near
flames or drain the fuel inside a building.
e Be careful and wear gloves when you check or service the cutting unit blades. Replace any damaged blades, do
not try to correct a damaged blade.
f Keep your hands and feet away from parts that move. Do not adjust the mower with the engine in operation,
unless the adjustment needs the engine in operation.
g Keep the mower and the engine clean.
h Allow the engine to become cool before storage.
i Keep all nuts, bolts and screws tight to make sure the equipment is in safe condition.
j Replace worn or damaged parts for safety. Replace damaged or worn decals. Only use parts, accessories and
attachments approved by Jacobsen.
k To decrease the fire hazard, remove materials that burn from the engine, muffler, battery tray and fuel tank area.
2.1.6 WHEN YOU PUT THE MOWER ON A TRAILER
a Use straps, chains, cables or ropes to fasten the mower to the trailer.
2.1.7 CHILDREN
Children are often attracted to the mower when you are mowing. If the operator does not know that children in the area,
accidents can occur. You must never assume that children will continue to stay where you last saw them.
a When you operate the mower, keep children away. Children must be watched by an adult other than the operator.
b Stop the mower immediately if a child enters the area of operation.
c Never allow children to operate the mower.
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2 SAFETY
2.1 IMPORTANT SAFETY NOTES _______________________________________________
This safety alert symbol is used to alert you to potential hazards.
DANGER - Indicates an imminently hazardous situation which, if not avoided, WILL result in death or serious injury.
WARNING - Indicates a potentially hazardous situation which, if not avoided, COULD result in death or serious
injury.
CAUTION - Indicates a potentially hazardous situation which, if not avoided, MAY result in minor or moderate injury
and property damage. It may also be used to alert against unsafe practices.
NOTICE - Indicates a potentially hazardous situation which, if not avoided, MAY result in property damage. It may
also be used to alert against unsafe practices.
For pictorial clarity, some illustrations in this manual may show shields, guards or plates open or removed. Under no
circumstances should this equipment be operated without these devices securely fastened in place.
!
WARNING
The Interlock System on this machine will stop the engine if the operator
releases the OPC (Operator Presence Control) bail.
To protect the operator and others from injury, never operate equipment with
the Interlock System disconnected or malfunctioning.
!
WARNING
1. Before leaving the operator’s position for any reason, release the OPC
bail. Allow the mower to settle to the ground.
2. Keep hands, feet, and clothing away from moving parts. Wait for all
movement to stop before you clean, adjust, or service the machine.
3. Keep the area of operation clear of all bystanders and pets.
4. Never operate mowing equipment without the guards securely fastened
in place.
By following all instructions in this manual, you will prolong the life of your machine and maintain its maximum
efficiency. Adjustments and maintenance should always be performed by a qualified technician.
If additional information or service is needed, contact your Authorized Jacobsen Dealer who is kept informed of the
latest methods to service this equipment and can provide prompt and efficient service.
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SPECIFICATIONS 3
3Specifications
3.1 ENGINE SPECIFICATIONS __________________________________________________
20 in. HoverKing 16 in. HoverKing
Make Honda Honda
Model GCV160 GXV57
Type Four cycle, overhead Cam Four cycle, overhead valve
Number of Cylinders 1 1
Bore and Stroke 2.5 in. (6.4 cm) x 2.0 in. (5.0 cm) 1.77 in. (4.5 cm) x 1.42 in. (3.6 cm)
Total Displacement
Intake System Naturally Aspirated Naturally Aspirated
Net Power 4.4 hp (3.3 kW) @ 3600 rpm 2.0 hp (1.5 kW)@ 4800 rpm
Torque 6.9 ft.Lb. (9.4 Nm) @ 2500 rpm 2.4 ft.Lb. (3.2 Nm) @ 4500 rpm
Maximum Speed 3600 ± 50 rpm (No Load) 4600 ± 50 rpm (No Load)
Low Idle 1400 ± 150 rpm (No Load) 2500 ± 200 rpm (No Load)
9.8 in
3
(0.160 l) 3.5 in3(0.057 l)
Rotation Counter-clockwise viewed at PTO shaft Counter-clockwise viewed at PTO shaft
Fuel Unleaded Gasoline, 87 Octane Minimum Unleaded Gasoline, 87 Octane Minimum
Fuel Tank Capacity 0.25 U.S. Gallon (0.93 l) 0.071 U.S. Gallon (0.27 l)
Engine Oil (API Class) 10W30 (SJ) 10W30 (SJ)
Oil Capacity 18.6 oz. (0.55 l) 8.4 oz. (0.25 l)
Start Method Recoil Start Recoil Start
Cooling System Forced Air Forced Air
Ignition System Transistorized Magneto Transistorized Magneto
Dry Weight 22 lb. (9.8 kg) 11.9 lb. (5.4 kg)
Dimensions
(Length x Width x Height)
14.4 x 13.0 x 13.7 in.
(36.7 x 33.1 x 34.7 cm)
9.8x 11.3 x 9.4 in.
(24.9 x 28.6 x 24.0 cm)
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3 SPECIFICATIONS
3.2 DIMENSIONS AND WEIGHTS ________________________________________________
20 Inch HoverKing 16 Inch HoverKing
A - Width of Cut 20 inch (50.8 cm) 16 inch (40.6 cm)
B - Maximum Width 23.4 inch (59.4 cm) 19.5 inch (49.5 cm)
C - Height (Standard Handle)
Handle at 30° angle from ground
D - Height (Extended Handle)
Handle at 30° angle from ground
E - Length (Standard Handle)
Handle at 30° angle from ground
F - Length (Extended Handle)
Handle at 30° angle from ground
G - Handle Length (Standard Handle) 50 inch (127 cm) 50 inch (127 cm)
H - Handle Length (Extended Handle) 67 inch (170 cm) 67 inch (170 cm)
Weight of unit, fuel tank filled x x
Weight of unit, fuel tank empty x-1.278 x-.45369
36.7 inch (93.2 cm) 32 inch (81.3 cm)
46.5 inch (118.1 cm) 41.8 inch (106.2 cm)
59 inch (149.9 cm) 59 inch (149.9 cm)
76 inch (193.04 cm) 76 inch (193.04 cm)
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20 inch (50.8 cm)
HoverKing
(Standard Handle)
SPECIFICATIONS 3
C
C
G
E
16 inch (40.6 cm)
HoverKing
(Standard Handle)
G
E
A
B
A
B
20 inch (50.8 cm)
HoverKing
(Extended Handle)
D
H
F
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3 SPECIFICATIONS
3.3 CUTTING UNIT SPECIFICATION _____________________________________________
Blade Length 4 in. (10.2 cm)
Number of blades 3
Height of cut 1 to 3 in. (2.5 to 7.6 cm)
Height of cut adjustment 1/2 in. (1.3 cm) spacers put between impeller
and blade disk.
3.4 RECOMMENDED LUBRICANTS______________________________________________
Engine Oil:
Must meet MIL-L-46152 or API Classification grades SJ
Temperature Viscosity
Above 50° F (10° C) SAE 10W-30 or SAE 30
Below 50° F (10° C) SAE 10W-30
3.5 ACCESSORIES ___________________________________________________________
3.5.1 METAL BLADE KIT ________________________________________________________
20 inch (50.8 cm) Kit number 32252
16 inch (40.6 cm) Kit number 32258
20 inch
(50.8 cm)
16 inch
(40.6 cm)
3.5.2 PLASTIC BLADE KIT_______________________________________________________
20 inch (50.8 cm) Kit Number 32253
16 inch (40.6 cm) Kit number 32259
20 inch
(50.8 cm)
16 inch
(40.6 cm)
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SPECIFICATIONS 3
3.5.3 STRING CUTTER KIT _______________________________________________________
20 inch (50.8 cm) Kit Number 32254
16 inch (40.6 cm) Kit number 32260
20 inch
(50.8 cm)
3.5.4 HANDLE EXTENSION KIT ___________________________________________________
20 inch (50.8 cm) HoverKing Kit number 32255
Includes longer bail and throttle control cables.
16 inch (40.6 cm) HoverKing Kit number 32261
Includes longer OPC switch harness.
16 inch
(40.6 cm)
3.5.5 WHEEL KIT _______________________________________________________________
Kit number 32256
3.6 SUPPORT LITERATURE ____________________________________________________
Contact your Jacobsen Dealer for a complete listing of literature available for your mower.
Technical Manual: 4325163
Engine Manual
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4 DECALS
4Decals
4.1 SAFETY DECALS _________________________________________________________
Understand the purpose of these decals. The decals are important to the safe operation of the mower. REPLACE THE
DAMAGED DECALS IMMEDIATELY.
DANGER
Injury or death can occur from contact with the
blade or from the objects discharged from the
mower.
WARNING
Read the manual.
Wear safety glasses, hearing protection and other required safety equipment.
Be careful of discharged objects. When the mower is in operation, keep persons and animals away.
Be careful when you operate the mower on slopes. To prevent slips or falls, only mow when the grass is dry.
Your hands or feet can be injured from contact with the blades. To prevent injury, disconnect the spark plug wire before
you service the mower.
Stay away from hot surfaces and moving parts. Never operate equipment that is not in correct order or without decals,
guards, shields, deflectors or other protective devices fastened.
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