Wright Manufacturing Sentar Commercial Mower User Manual


Commercial Mower Owner’s Manual

For Sentar Serial #19729 and higher until superseded


For your safety and for proper operation and maintenance read carefully and keep readily available for future reference.

Additional replacement owner’s manuals (Part #79490103), as well as illustrated parts lists (Part #79490104), are available from your authorized Wright Dealer for a nominal charge or if a dealer is not available by contacting Wright Manufacturing, Inc. Please indicate the complete model number and serial number of your Wright product.

For reference please note the following information at the time of purchase:

SERIAL # _________________________

MODEL # _________________________

DATE OF PURCHASE ______________________



Welcome to the progressive group of mowing professionals who use Wright mowers. We are focused on giving you advanced engineering and quality construction in each mower we build.

This manual explains the features and promotes safer use of the mower. Please read it and follow the instructions carefully so that you can have many years of productive mowing.

For service, remember that your Wright dealer knows your mower best and is interested in your satisfaction. He can provide you with quality maintenance and other assistance that you may need.

Please give this manual to anyone who may use the mower for them to study before they operate it. Give the manual to anyone to whom you may sell the mower in the future. It is important that the next owner receive this information also.

As Wright Manufacturing, Inc. is constantly seeking ways to improve its products, the mower you have may differ slightly from the information and specifications in this manual. Because of our continuous product improvement, Wright reserves the option to make changes at any time without notice.

Wright Manufacturing, Inc.


This is the safety alert symbol. It is used throughout this manual and on the mower’s safety labels to alert you to potential personal injury hazards. Obey all safety messages that follow this symbol to avoid possible injury or death. Read these instructions carefully. It is essential that you read the instructions and safety precautions before you attempt to work on or use this unit.


This symbol with the “WARNING” indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.


This symbol with the word “CAUTION” indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.

1998-2001 Wright Manufacturing, Inc. All rights reserved. This material may not be reproduced or copied, in whole or part, without written permission from Wright Manufacturing, Inc. Grass Gobbler, Gobbler, Leaf Gobbler, Velke, Pro 1, X2, Stander, and Sentar are trademarks of Wright Manufacturing, Inc.



Safety Instruction Manual


General Safety Instructions Owner/User Notice

User Experience and Qualifications

User Clothing

Inspection of Mower Before Each Use

Scheduled Mower Maintenance Safety

Work Area Conditions and Inspection

Initial Operating Safety Guidelines

Replacement Parts

Operation on Slopes

Operation During Zero-Radius Turns

Operation in Reverse

Operation in Forward Direction

Fuel Safety Hydraulic Safety

Pre-Delivery Service of Mower by Dealer

Operating Instructions

Inspect Mower Before Each Use How to Start the Mower

Unusual Noises or Irregular Operation

How to Drive the Mower

How to Stop and Park the Mower How to Drive the Mower Over a Curb

How to Use the Mower on Varying Terrain How to Adjust Neutral

How to Change the Speed/Sensitivity Adjustment How to Perform the Tracking Adjustment

How to Test/Use the Blade Clutch/Brake Switch

How to Test the Operator Presence Control (OPC) Switch

Service and Adjustments

Tire Maintenance and Pressure


Deck Adjustments

Belt Tension Adjustment

How to Move the Mower if the Engine Won’t Start Bleeding Air from the Hydraulic System

Battery Service

Maintenance Service Intervals

Limited Warranty


This symbol with the word “WARNING” indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.


This symbol with the word “CAUTION” indicates a potentially hazardous situation which, if not avoided, could result in minor or moderate injury.





This mower is built to the highest standards in the industry. However, carelessness or operator error may result in serious bodily injury or death. Accident and hazard prevention are dependent upon the awareness, concern, wisdom, and proper training of the personnel involved in the operation, transport, maintenance, and storage of the equipment. Make sure every operator is properly trained and thoroughly familiar with all of the information in this manual before operating the equipment.


The Wright Sentar is designed with your safety in mind. It has the following safety systems with which you should be familiar:

The warning decals on the mower including the instrument panel warning

The blade switch must be “off” before starting the engine

Your feet must be on the foot platform in order to engage the blades

If you remove your feet from the foot platform while the blades are running the engine will stop and the blades will brake in seconds

Letting go of the hand controls will stop the wheels instantly

Spring loaded chute deflector helps reduce trajectory of thrown objects

Belt/pulley covers on cutter deck

Anti-tip rollers are provided at the rear of the mower to minimize the possibility of tipping back and over on the operator


Owner/User Notice:

The owner’s/user’s obligation is to instruct themselves and all potential users in the safe operation of this equipment and be sure they read and follow the instructions in this safety manual and other material provided by Wright Manufacturing, Inc. before using or allowing others to operate the equipment. Do not operate this unit unless you carefully read, understand and follow the assembly, installation, and safety instructions contained in this manual and the warning decals provided on the unit. Do not allow other persons to use this unit unless you make sure they carefully read, understand and follow these instructions. Never allow children to operate or play on the unit.


User Experience and Qualifications:

This product is designed for use by physically fit, experienced, professional commercial mower operators who have a minimum of 160 hours of experience operating twelve horsepower and greater industrial mowers. Operators must be 18 years or older and weigh at least 120 pounds and no more than 350 pounds They must have read and understood this manual. DO NOT allow children to operate the mower. Do not allow adults to operate the mower without proper instruction mentioned above. Never allow passengers on the mower.


User Clothing:

DO NOT operate the mower while wearing sandals, tennis shoes, sneakers, or shorts. Always wear long non-baggy pants. Wear hightop leather work boots with thick, textured tread, soft-rubber soled at all times. Hard or smooth soled shoes are too slippery for a good footing on mower platform. NEVER wear loose-fitting clothing or jacket pockets that can get caught to the handlebars or control levers of any mower you drive. Wearing safety glasses, ear protection and safety shoes is advisable and required by some local ordinances and insurance regulations.


Inspection of Mower Before Each Use:

DO NOT use the mower if any parts are not maintained in good operating condition. Examine the moving parts prior to each use. Look for excessive wear, bald or worn tires, cracks in parts, loose or missing bolts, cotter, linchpin or “hair” pins or cable yoke pins and replace before operating the mower. Make sure all safety equipment provided with the mower is in good operating order, including all the warning decals and the required operator-presence device which stops the engine and blades when the footoperated Operator Presence Control (OPC) switch is released. (To test the OPC, follow instructions in the Operating Instructions section of this manual.) Inspect the two anti-tip rollers and their respective bolts at the rear of the mower for tightness and proper operation. Be sure that all parts of the hand-operated transmission control system are tight and secure. This is to reduce the possibility that the mower could have a loss of control or safety.


Scheduled Mower Maintenance Safety:

Replace worn tire(s) with less than 3/32” of any tread groove left. Use tires with the tread pattern

specified by Wright Mfg., Inc. only. DO NOT change the engine governor settings or over-rev the engine contrary to engine manufacturer specifications. Keep the Wright mower in good operating condition, and keep safety devices and shields in place and in working condition. Keep all nuts, bolts, and screws tight to be sure the equipment is in safe working condition. Check the blade mounting bolts for proper tightness every eight (8) hours of operation. Check the blades for excessive wear and sharpness every four to eight (4-8) hours of operation. Replace excessively worn blades. Sharpen dull blades. The mower should not be used after the blades or other part of the mower strikes a foreign object, until conducting a thorough inspection and any damage is repaired. See the instructions in the Recommended Maintenance section of this manual for other items of required maintenance.


Work Area Conditions and Inspection:

Prior to operating the unit, carefully inspect all lawn/ground areas where you plan to use the mower for hidden, hard-to-see objects or uneven ground that may be hidden in the grass. Clear the work area of moveable objects such as wires, rocks, glass, etc. that might be picked up by the mower and dangerously thrown. Remove, if possible, or mark the location of all immovable objects or irregular areas and be sure not to hit them with any part of the mower, its deck or the blades. Obstacles such as holes, abrupt changes in ground contour, tree trunks, stumps or roots, pipes protruding from the ground, paving edges, etc. in the path of operation can abruptly turn or stop the mower. This could throw you off the mower or into and possibly over the handle bars causing serious injury or death. The faster you are moving the more potential there is for injury. Mow only in daylight or in good artificial light. Keep away from drop-offs, the edges of ponds, streams, pools, etc. especially at the bottom of slopes. Do not mow when children or others are around. When the Wright mower is in use, never direct the grass discharge toward bystanders, traffic, cars or buildings nor allow anyone near the machine while in operation. Thrown objects can pass

through glass windows and some walls of buildings. There is extreme risk of danger from thrown objects or being cut by the blades of the mower or being run over if you lose control. Never operate the mower in an enclosed area without good, approved ventilation. Exhaust fumes are dangerous.


Initial Operating Safety Guidelines:

Read and understand the warnings on the instrument panel of the mower.

Keep a firm hold on the stationary handle at all times.

Keep both feet on the foot platform at all times.

Know the controls and how to stop quickly.

Before attempting to start the engine, follow all starting instructions below and in the engine operator’s manual.

Look behind before backing up.

Before leaving the operator’s position, even momentarily, turn off the blade clutch engagement switch and apply the parking brake. Keep others from coming near the mower. Get back on the mower as soon as possible.

When leaving the Wright mower unattended, turn off the blade clutch engagement switch, apply the parking brake, stop the engine and remove the key. Never leave the machine unattended on a slope in case someone disengages the parking brake which would be hazardous if the mower were to roll.

When transporting, driving onto transport vehicles, into buildings, across parking lots or otherwise not mowing grass, turn off the blade clutch engagement switch to reduce risk of thrown objects and rotating blade hazard. After coming to a stop apply the parking brake, stop the engine and remove the key.

Before performing any maintenance or repair service, disengage power to blades, apply the parking brake, stop the engine, remove ignition key and spark plug wire from spark plug(s).

All operators of this mower should exercise caution when driving this mower at high

speeds. Sudden stops from excessive speeds may cause serious injury.

DO NOT allow inexperienced people to operate the mower until they have read and understood these safety instructions. Operate the mower at slower speeds while becoming familiar with it.

The grass discharge chute deflector must be installed at all times and in the down position except that it may be raised when the grass catcher is completely installed or a mulch kit is completely installed.

If the mower discharge clogs, turn off the blade clutch switch, apply the parking brake, stop the engine and remove the key before removing obstruction.

Keep all shields and covers in place, especially grass discharge chute deflector and the blade belt covers.

Keep hands, feet and clothing away from rotating parts, especially the rear wheels, blades, engine flywheel, belts and pulleys.

Do not touch engine or muffler while engine is running or soon after it is stopped. These areas can be so hot as to cause severe burns.

Clean grass, leaves and lubricant spills from surfaces after use to prevent fire hazard.

Be alert for traffic when crossing roads or operating near roadways.

Before climbing curbs, crossing gravel drives, sidewalks or roads, turn off the blades, lift them into transport position, and wait for them to stop.


Replacement Parts:

Use of parts other than specified parts supplied by Wright Manufacturing, Inc. may compromise the safe use of the mower, are not recommended and their use could void the warranty.


Operation on Slopes:

DO NOT operate on steep slopes. Do not operate the mower on slopes steeper than you can feel secure about the traction of the tires and

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