MAYO 750 User manual

BELTED
SCREEN SIZER
Model 750
OPERATOR'S MANUAL

MAYO MANUFACTURING, INC. LIMITED WARRANTY
THE FOLLOWING WARRANTIES FOR MACHINERY, EQUIPMENT OR PARTS SOLD BY MAYO MANU-
FACTURING, INC. ARE IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, OR THOSE
WARRANTIES IMPOSED BY STATUE, INCLUDING, BUT NOT LIMITED TO ANY AND ALL IMPLIED WAR-
RANTIES OR MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND OF ANY AND ALL
OTHER WARRANTY OBLIGATIONS ON THE PART OF MAYO MANUFACTURING, INC. (The Company).
The Company warrants the machinery, equipment or parts delivered against faulty workmanship or the
use of parts delivered against faulty workmanship or the use of defective materials for a period of one (1)
year from the date of shipment.
The Company's warranties set forth above are the only warranties made by the Company and shall not be
enlarged, diminished or aected by, and no obligation or liability shall arise out of the Company's rendering
technical or other advice or service in connection with the machinery, equipment or parts.
Parts or components furnished to the Company by third persons are guaranteed only to the extent of the
original manufacturer's guarantee to the Company, a copy of which will be supplied to the Purchaser upon
written request to the Company.
LIABILITY
THE COMPANY'S SOLE AND EXCLUSIVE MAXIMUM LIABILITY, AND PURCHASER'S SOLE AND EX-
CLUSIVE REMEDY under the above warranty shall be, at the Company's option, the repair, or replacement
of the machine, equipment or part which is found to be defective due to faulty workmanship or defective
materials, and is returned by the Purchaser to the Company within the warranty period. Shipment both
ways and in transit damage shall be at the purchaser's risk and expense. If the Company elects to repair or
replace the machine, equipment, or part, the Company will have a reasonable time within which to do so.
The remedies set forth above are available upon the following conditions:
1. Purchaser has promptly notied Company upon discovery that the machinery, equipment, or parts are
defective due to faulty workmanship or defective materials; and
2. Purchaser provides Company with a detailed description of the deciencies; and
3. Company's examination discloses that the alleged deciencies exist and were not caused by acci-
dent, re, misuse, neglect, alteration, or any other hazard or by Purchaser's improper installation, use or
maintenance.
Such repair or replacement shall constitute fullment of all Company's liability to Purchaser, whether
based on contract or tort.
This warranty does not apply to any machine that has been altered outside the factory in any way so as,
in the judgement of Mayo, to aect its operation, reliability or safety, or which has been subject to misuse,
neglect or accident.
In the event the Company breach any other provisions of the Purchase Agreement, the Company's EX-
CLUSIVE MAXIMUM LIABILITY AND PURCHASER'S EXCLUSIVE REMEDY, whether in contract or tort,
otherwise shall not in any event exceed the contract price for the particular machine, piece of equipment
or parts involved.
IN NO EVENT SHALL COMPANY BE LIABLE TO ANYONE FOR SPECIAL, COLLATERAL, INCIDENTAL,
OR CONSEQUENTIAL DAMAGES FOR BREACH OF ANY PROVISIONS OF THIS CONTRACT OR WAR-
RANTY. SUCH EXCLUDE DAMAGES INCLUDE, BUT ARE NOT LIMITED TO, costs of REMOVAL AND
REINSTALLATION OF ITEMS, Loss of GOODWILL, LOSS OF PROFITS, LOSS OF USE OR INTERRUP-
TION OF BUSINESS.
WARRANTY VOID IF NOT REGISTERED

MAYO MANUFACTURING, INC.
MODEL 750 BELTED SCREEN SIZER
DEALER INSPECTION REPORT
SAFETY
_______All Decals Installed
_______Review Operating & Safety Instructions
_______Inspect Electrical System
_______Lubricate Machine
_______Drive Chain Tensioned and Aligned
_______Speed Reducer Gearbox Oil Level Checked
_______Check Condition of Sizing Belt
_______Check Condition, Tension and Alignment of
Elevator, Inline and Cross Conveyor
_______System Components
WARRANTY REGISTRATION FORM & INSPECTION REPORT
WARRANTY REGISTRATION
This form must be lled out by the dealer and signed by both the dealer and the customer at the time of
delivery.
Customer’s Name ____________________________ Dealer's Name ______________________________
Address _____________________________________ Address____________________________________
City, State/Prov., Code ________________________ City, State/Prov., Code _______________________
Phone Number ( _____ ) ______________________
Washer Model________________________________
Serial Number ________________________________
Delivery Date_________________________________
WHITE YELLOW PINK
MAYO MFG., INC. DEALER CUSTOMER
I have thoroughly instructed the buyer on the above described equipment which review included the
Operator’s Manual content, equipment care, adjustments, safe operation and applicable warranty policy.
Date ____________________________________ Dealer’s Rep. Signature _____________________________
Signature ________________________________
The above equipment and Operator’s Manual have been received by me and I have been thoroughly in-
structed as to care, adjustments, safe operation and applicable warranty policy.
Date ____________________________________ Owner's Signature _________________________________

SERIAL NUMBER LOCATION
Always give your dealer the serial number of your Mayo Belted Screen Sizer when ordering parts or re-
questing service or other information.
The serial number plate is located where indicated. Please mark the number in the space provided for
easy reference.
Model Number __________________________________
Serial Number __________________________________
SERIAL NUMBER LOCATION

TABLE OF CONTENTS
SECTION DESCRIPTION PAGE
1 Introduction ......................................................... 1
2 Safety.................................................................... 3
2.1 General Safety ....................................................... 4
2.2 Equipment Safety Guidelines ................................ 5
2.3 Storage Safety....................................................... 5
2.4 Safety Training ....................................................... 6
2.5 Safety Signs........................................................... 6
2.6 Preparation ............................................................ 7
2.7 Installation Safety .................................................. 7
2.8 Lock-Out Tag-Out Safety ...................................... 7
2.9 Operating Safety.................................................... 8
2.10 Maintenance Safety............................................... 8
2.11 Transport Safety .................................................... 9
2.12 Electrical Safety..................................................... 9
2.13 Employee Sign-O Form ..................................... 10
3 Safety Sign Locations ....................................... 11
4 Operation............................................................ 17
4.1 To the New Operator or Owner............................ 17
4.2 Machine Components ......................................... 18
4.3 General Operation Theory ................................... 20
4.4 Machine Break-In ................................................ 21
4.5 Pre-Operation Checklist ...................................... 22
4.6 Controls ............................................................... 23
4.7 Machine Preparation ........................................... 26
4.8 Operating............................................................. 28
4.9 Transport.............................................................. 33
4.10 Storage ................................................................ 36

TABLE OF CONTENTS
SECTION DESCRIPTION PAGE
5 Service and Maintenance ................................. 38
5.1 Service................................................................. 38
5.1.4 Service Record .................................................... 49
5.2 Maintenance ........................................................ 50
5.2.1 Electrical System Inspection ............................... 50
5.2.2 Speed Reducer Gearbox Oil ............................... 51
5.2.3 Breather Cleaning................................................ 52
5.2.4 Drive Chain Maintenance .................................... 53
5.2.5 Sizing Belt Maintenance ...................................... 54
5.2.6 Elevator Belt Maintenance................................... 56
5.2.7 Cross Conveyor Maintenance ............................. 57
5.2.8 Inline Conveyor Maintenance .............................. 58
6 Trouble Shooting................................................ 59
 7 Specications .................................................... 61
7.1 Mechanical .......................................................... 61
7.2 Bolt Torque .......................................................... 62
7.3 Electrical Schematic ............................................ 63
8 Index ................................................................... 64

1
1 INTRODUCTION
Congratulations on your choice of a Mayo Model 750 Belted Screen Sizer and welcome to Mayo's quality
line of potato handling equipment. This equipment is designed and manufactured to meet the needs of a
discriminating buyer in the agricultural industry for the loading, unloading, processing, sizing and storing of
harvest yields.
Safe, ecient and trouble free operation of your new Mayo Screen Sizer requires that you, and anyone else who
will be operating or maintaining the Screen Sizer, read, understand and practice ALL of the Safety, Operation,
Maintenance and Troubleshooting recommendations contained within this Operator's Manual.
This manual applies to all Model 750 Belted Screen Sizers manufactured by Mayo. Certain options may be
available to specically tailor the Screen Sizer to your operation and may not be included in this manual.
Please contact the manufacturer regarding additional information about these options. Use the Table of Con-
tents and Index as a guide to nd specic information.
Keep this manual handy for frequent reference and so that it will be passed on to new operators or owners.
Call your Mayo dealer if you need assistance, information or additional copies of this manual.
MACHINE ORIENTATION - The intake end of the frame is the front. The control panel is on the left side of the
frame.

2

3
The Safety Alert symbol identies
important safety messages on your
Mayo Belted Screen Sizer and in the
manual. When you see this symbol,
be alert to the possibility of personal
injury or death. Follow the instruc-
tions in the safety message.
2 SAFETY
SAFETY ALERT SYMBOL
If you have any questions not answered in this manual or require additional copies or the manual is damaged,
please contact your dealer or Mayo, P.O. Box 497, Bus Highway 2, East Grand Forks, Minnesota, 56721.
(Telephone) 218-773-1234, (FAX) 218-773-6693 or toll free at 1-800-223-5873.
Accidents Disable and Kill
Accidents Cost You Money
Accidents Can Be Avoided
Why is SAFETY important to you?
This Safety Alert symbol means
ATTENTION! BECOME ALERT!
YOUR SAFETY IS INVOLVED!
3 Big Reasons
DANGER -Indicates an imminently hazardous sit-
uation that, if not avoided, will result in
death or serious injury. This signal word
is to be limited to the most extreme
situations, typically for machine com-
ponents that, for functional purposes,
cannot be guarded.
WARNING - Indicates a potentially hazardous situ-
ation that, if not avoided, could result
in death or serious injury, and includes
hazards that are exposed when guards
are removed. It may also be used to
alert against unsafe practices.
CAUTION - Indicates a potentially hazardous situ-
ation that, if not avoided, may result in
minor or moderate injury. It may also be
used to alert against unsafe practices.
SIGNAL WORDS:
Note the use of the signal words DANGER,
WARNING and CAUTION with the safety
messages. The appropriate signal word for each
message has been selected using the following
guide-lines:

4
2.1 GENERAL SAFETY
1. Read and understand the
Operator's Manual and all
safety signs before supplying
power to, operating, maintain-
ing or adjusting the Screen
Sizer.
2. Only trained, competent persons shall operate the
Screen Sizer. An untrained operator is not quali-
ed to operate this machine.
3. Provide a rst-aid kit for use in
case of an accident. Store in a
highly visible place.
4. Provide a re extinguisher for use in
case of an accident. Store in a highly
visible place.
5. Install and properly secure all guards
and shields before
operating.
6. Wear appropriate
protective gear.
This list includes
but is not limited
to:
- Protective
shoes with slip
resistant soles
- Protective glasses or goggles
- Heavy gloves
- Hearing protection
7. Turn machine OFF, place all controls in their OFF
position, shut down and lockout power supply
and wait for all moving parts to stop before ser-
vicing, adjusting, maintaining, repairing or clean-
ing. (Safety lockout devices are available through
your Mayo dealer parts department).
8. Know the emergency medical center number for
your area.
9. Review safety related items with all operators
annually.
SAFETY
YOU are responsible for the SAFE operation and
maintenance of your Mayo Belted Screen Sizer. YOU
must ensure that you and anyone else who is going
to operate, maintain or work around the Screen Sizer
be familiar with the operating and maintenance pro-
cedures and related SAFETY information contained
in this manual. This manual will take you step-by-
step through your working day and alerts you to all
good safety practices while operating the Screen
Sizer.
Remember, YOU are the key to safety. Good safety
practices not only protect you but, also the people
around you. Make these practices a working part of
your safety program. Be certain that EVERYONE
operating this machine is familiar with the proce-
dures recommended and follows safety precautions.
Remember, most accidents can be prevented. Do
not risk injury or death by ignoring good safety prac-
tices.
• Read and understand the Operator's Manual
and all safety signs before supplying power to,
operating, maintaining or adjusting the Screen
Sizer.
• Screen Sizer owners must give operating instruc-
tions to operators or employees before allowing
them to operate the Screen Sizer, and at least an-
nually thereafter.
• The most important safety device on this equip-
ment is a SAFE operator. It is the operator’s re-
sponsibility to read and understand ALL Safety
and Operating instructions in the manual and to
follow these. Most accidents can be avoided.
• A person who has not read and understood all
operating and safety instructions is not qualied
to operate this machine. An untrained operator
exposes himself and bystanders to possible seri-
ous injury or death.
• Do not modify the equipment in any way.
Unauthorized modication may impair the func-
tion and/or safety and could aect the life of the
equipment.
• Think SAFETY! Work SAFELY!