Gravely 991246 User Manual

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ZT HD

Pro-Turn Z / ZX

991240 – ZT HD 44

(SN 000101 +)

991242 – ZT HD 48

(SN 000101 +)

991244 – ZT HD 52

(SN 000101 +)

Operator’s Manual

Manuel de I’utilisateur

09199900B • 11/20

Printed in USA

E10

ENGLISH

FRANÇAIS

991246 – ZT HD 60

(SN 000101 +)

991248 – ZT HD 48

(SN 000101 +)

991250 – ZT HD 52

(SN 000101 +)

991252 – ZT HD 60

(SN 000101 +)

991254 – Pro-Turn Z 48

(SN 000101 +)

991256 – Pro-Turn Z 52

(SN 000101 +)

991258 – Pro-Turn Z 60

(SN 000101 +)

991260 – Pro-Turn ZX 48

(SN 000101 +)

991262 – Pro-Turn ZX 52

(SN 000101 +)

991264 – Pro-Turn ZX 60

(SN 000101 +)

Models

Table of Contents

Questions and Answers:

J
Jamie BradfordAug 12, 2025
How to troubleshoot starting issues with my Gravely Lawn Mower?
- M
  Michael DickersonAug 12, 2025
  If your Gravely Lawn Mower engine doesn't start, there are several potential causes. First, the safety interlock system might not be engaged or could be faulty. Also, the fuel tank could be empty, or the fuel supply might be contaminated, requiring replacement with clean fuel. The battery could be discharged, needing a charge. A loose connection between the battery and cables can also prevent starting, so ensure they are tightened and clean. Spark plug wires might be loose, or the spark plugs themselves could be faulty, requiring connection or replacement. In some cases, the electrical system or the engine itself might be faulty, in which case you should contact your Gravely dealer.
H
Heather WheelerAug 16, 2025
What to do if my Gravely 991246 Lawn Mower does not drive?
- M
  Mary KnightAug 16, 2025
  If your Gravely Lawn Mower does not drive, one potential cause is that the transaxles are bypassed. If this is the case, engage the levers. It's also possible that the transaxle drive belt is faulty, or that the transaxles themselves are faulty, which would require contacting your Gravely dealer.
G
Garrett MendozaAug 20, 2025
Why is my Gravely Lawn Mower's cutting quality so poor?
- J
  Jared ReedAug 20, 2025
  If your Gravely Lawn Mower exhibits poor cutting quality, several factors could be responsible. First, the mower blades might not be level, or the mower deck pitch could be incorrect. It's also possible that the mower blades are dull or faulty, requiring sharpening or replacement. Another factor could be mowing speed is too fast, so try driving slower when cutting grass. Also, belt tension or condition might be poor, requiring replacement of mower belts. Finally, the cutting height might be too low, so avoid setting the height of cut too low, and for very tall grass, mow twice.
B
Brian HarrisonAug 25, 2025
What to do if the PTO malfunctions on my Gravely Lawn Mower?
- R
  Robert ReevesAug 25, 2025
  If the PTO malfunctions on your Gravely Lawn Mower, it could be due to a few reasons. The operator presence switch might not be engaged; make sure to activate it by sitting on the operator seat. It's also possible that the operator presence switch itself is faulty. Another cause could be a faulty PTO belt, which would need replacement. In some cases, the PTO switch, wiring, connectors, or clutch might be faulty, which would require contacting your Gravely dealer.
R
Raymond BellAug 27, 2025
Why does my Gravely Lawn Mower engine run rough?
- R
  Robert Burgess Jr.Aug 28, 2025
  If your Gravely Lawn Mower engine runs rough, one potential cause is that the choke control knob is in the 'on' position. If this is the case, move the knob to the 'off' position. Another possibility is that the air filter cartridge is plugged, which means you should clean or replace it. In some cases, the engine itself might be faulty, requiring assistance from your Gravely dealer.
K
karen11Aug 31, 2025
Why is my Gravely Lawn Mower engine overheating?
- J
  Jessica DavidsonAug 31, 2025
  If your Gravely Lawn Mower engine overheats, it could be due to a few reasons. The engine oil level might be low, requiring you to add engine oil. Another possibility is that the cooling fins are plugged, which means you should clean the engine. In some cases, the engine itself might be faulty, requiring assistance from your Gravely dealer.
I
imooreSep 4, 2025
Why does my Gravely 991246 Lawn Mower move when off and the parking brake is on?
- K
  Kathryn RiddleSep 4, 2025
  If your Gravely Lawn Mower moves with the engine off and the parking brake engaged, it could be that the parking brake needs adjustment. You can adjust the parking brake lever. It's also possible that the parking brake itself is faulty, which would require contacting your Gravely dealer.
A
Alex EwingSep 8, 2025
Why doesn't my Gravely 991246 Lawn Mower drive straight?
- J
  Jennifer ThomasSep 8, 2025
  If your Gravely Lawn Mower does not drive straight, it could be due to incorrect tire pressure, so check the tire pressure. Another possible cause is that the steering levers need adjustment.

Gravely 991246 Specifications

General

Brand	Gravely
Model	991246
Category	Lawn Mower
Language	English

Summary

SAFETY

SAFETY ALERT SYMBOL

Symbol indicates your safety is involved; be alert and obey all safety messages.

SIGNAL WORDS

Safety alert symbol and words indicate hazard levels: Danger, Warning, Caution, Notice.

SAFETY INSTRUCTIONS

Safe Practices for Ride-On Mowers

Proper use of mower is essential; improper use can cause serious injury or death.

Preparation Before Operating

Inspect unit for damage, clear area of objects, keep bystanders away.

Children Specific

Keep children away from operating area; do not allow those under 18 to operate.

Slope Specific

Exercise extra caution on slopes; do not operate on slopes over 15 degrees.

ROPS (Pro-Turn Z / ZX)

ROPS is integral safety; keep it raised and locked when operating.

ASSEMBLY

CONTROLS AND FEATURES

IGNITION KEY

Controls power to the engine; key cannot be removed when in run position.

THROTTLE CONTROL LEVER

Controls engine speed by moving lever forward for fast, backward for slow.

POWER-TAKE-OFF (PTO) KNOB

Controls power to mower blades; engine will not start with PTO knob on.

HEIGHT-OF-CUT ADJUSTMENT SYSTEM

System used to set the cutting height of the mower deck.

PARKING BRAKE LEVER

SAFETY INTERLOCK SYSTEM

Monitors unit features for operator safety.

STEERING LEVERS

OPERATION

EMERGENCY STOPPING

Procedure to stop unit quickly in an emergency situation.

BEFORE OPERATING UNIT

Checks before starting: fuel, oil, air cleaner, and safety interlock system.

POSITION ROPS

Procedure to raise the ROPS center bar and secure it for operation.

START THE ENGINE

Step-by-step instructions for starting the engine, including choke and throttle settings.

OPERATE UNIT

Instructions for moving and operating the unit, including controls and mowing tips.

STOP THE ENGINE

Procedure to safely stop the engine and unit.

MOVE UNIT MANUALLY

MAINTENANCE

MAINTENANCE SCHEDULE

Table outlining services and their recommended intervals for unit maintenance.

SERVICE PARTS

SERVICE POSITION

CHECK SAFETY INTERLOCK SYSTEM

Tests to verify the safety interlock system is functioning correctly.

CHECK PARKING BRAKE

CHECK MOWER BLADES

CHECK HYDRAULIC SYSTEM

Change Hydraulic Oil and Filter

Purge Hydraulic System

ADJUSTMENTS

ADJUST SEAT

ADJUST STEERING LEVERS

Adjust steering lever height and position for operator comfort.

Adjust Limiter Bolts

ADJUST UNIT TO DRIVE STRAIGHT

Adjust tire pressure and limiter bolts to ensure the unit drives straight.

Adjust Tire Pressure

TROUBLESHOOTING

Engine does not start

Lists probable causes and corrections for the engine failing to start.

Engine runs rough

Engine overheats

Unit does not drive

Lists probable causes and corrections for the unit failing to move.

PTO malfunctions

Unit moves with engine off and parking brake engaged

Unit does not drive straight

Lists probable causes and corrections for the unit not tracking straight.

Unit creeps when steering levers are in neutral position

Poor cutting quality

Lists probable causes and corrections for unsatisfactory grass cutting results.

Blades do not stop within 5 seconds

Lists probable causes and corrections for blades not stopping promptly after disengagement.

SPECIFICATIONS

Limited Warranty

Exclusions and Limitations

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