DOSKO 620-20HE - User Manual

1
Owner’s Manual
Instructions for Operation, Maintenance
Stump and Root Grinder
337-13HC, 357-13HE, 337S-13HC
620-20HE, 620-25KE
Your Dosko grinder is intended for outdoor-use only and can be used to remove many tree stumps and
exposed root systems close to ground level. By moving the blade in sweeping movements laterally over
the top and front of the stump, you can gradually grind it away. Make sure you completely read and
understand this manual before using the grinder for the first time.
WARNING
READ and UNDERSTAND this manual completely before using the grinder! Failure to properly operate,
and maintain this grinder could result in serious injury or death to the operator or bystanders.
All machines have hazards associated with their operation. This stump grinder has certain special hazards,
which you must be aware of. As an operator or owner you have a duty to be aware of these hazards and know
preventive measures to take to avoid them. When reading this manual pay particular attention to avoiding these
hazards.
In particular, be aware of the following:
 Know location of buried electrical and other utility lines.
 Do not allow children or untrained adults to operate.
 Wear eye protection and other personal protection against flying rocks and debris.
 Check that cutter wheel teeth are secured, sharp and not missing.
 Do not operate if operator presence bar fails to stop engine upon release.
 Make sure no children or bystanders are within 75 feet of stump grinding operation.
 Protect cars, windows and other objects within 75 feet from flying debris.
 Be prepared for machine “kickback” when initially contacting the stump.
 Be aware of potential for carbon monoxide (CO) poisoning.
 Prevent fires/explosions from fueling.
 Do not attempt to perform adjustments, declog or clean unit while engine is running.
 Avoid burns from engine or hot exhaust.
 Avoid using in wet or icy conditions where falls may occur.
Details about these hazards are found throughout the manual and are summarized at the end of the manual under
“Important Safety Information.”
STOP!
ADD ENGINE OIL, FUEL & BATTERY: Your stump grinder comes fully assembled and requires only that you add
engine oil to crankcase, fuel to tank, and a battery.
INSPECT COMPONENTS: Closely inspect to make sure no components are missing or damaged. See the “Receiving
Your Unit” section for instructions on whom to contact to report missing or damaged parts.
Any Questions, Comments, Problems, or Parts Orders
Call your dealer or Dosko Customer Service 1-866-298-3659
MODEL NUMBER: 337-13HC, 357-
13HE, 337S-13HC
620-20HE, 620-25KE
SERIAL NUMBER: _____________
M2961000V.1

Summary

About Your Grinder

Owner;Operator;Renter Training

Guidance for users and rental companies on manual usage.

Rental Companies

Specific instructions for rental businesses and their customers.

Engine Instructions

Reference to the separate engine owner's manual for operation.

Product Suitability

User's responsibility to determine product suitability for intended use.

Warranty Registration

Instructions for registering the product for warranty purposes.

Safety Decal Locations

Safety Decals

Flying Debris Hazards

Warnings about debris projection and impact.

Mechanical & Burn Hazards

Warnings on entanglement, amputation, burns, and towing.

Health & Environmental Warnings

Alerts on poisonous gas and California Proposition 65.

Fire & Explosion Risks

Precautions against fire and explosion hazards.

Transporting and Receiving

Receiving Your Unit

Steps for inspecting the grinder upon delivery.

Towing Instructions

Guidelines for safely towing the grinder.

Machine Component Identification

Part II. Operation

Pre-Start Check List & Procedures

Essential checks before starting the grinder engine.

Starting the Grinder

Detailed instructions for starting the engine.

Stopping the Engine

Procedure for safely shutting down the grinder's engine.

Grinding the Stump

Step-by-step guide for grinding stumps.

Refueling

Instructions and safety precautions for adding fuel.

Storing the Grinder

Procedures for proper storage of the grinder.

Part III. Maintenance and Repair

Belt Tension Adjustment

Procedure for adjusting the belt tension.

Stop-Switch Adjustment

How to adjust or replace the stop switch.

Setting Teeth

Process for installing and maintaining cutting teeth.

Maintenance Schedule

Recommended maintenance intervals and checks.

Specifications

Part IV. Important Safety Information

Summary of Important Safety Information

Overview of key safety procedures and measures for using the grinder.

Special Safety Information on Static Electricity

Guidance on preventing static electricity hazards during fueling.

Exploded View

Parts List

Wiring Diagram

Assembly Instructions

Handle Assembly

Maneuvering and installing the handle and related components.

Brake Lever & Air Cleaner Installation

Mounting the brake lever and installing air cleaner assembly and hose.

Limited Warranty Policy

DOSKO 620-20HE Specifications

General

Brand	DOSKO
Model	620-20HE
Category	Grinder
Language	English