Kubota Z231BR-AU Operator's Manual
  1. Manuals
  2. Brands
  3. Kubota Manuals
  4. Lawn Mower
  5. Z231BR-AU
  6. Operator's manual

Kubota Z231BR-AU Operator's Manual

Zero turn mower
Hide thumbs
Table of Contents

Advertisement

Quick Links

AY . A . 2 - 2 . - . AK
PRINTED IN U.S.A.
Z
2
3
1
B
R
A
U
·
Z
2
3
1
K
H
A
U
·
Z
2
5
1
B
R
A
U
·
Z
2
5
1
K
H
A
English (Australia)
U
Code No. K3014-7127-1
©
KUBOTA Corporation 2019
OPERATOR'S MANUAL
1WNAM00001A01
READ AND SAVE THIS MANUAL
MODELS Z231BR-AU
Z231KH-AU
Z251BR-AU
Z251KH-AU

Advertisement

Table of Contents
loading

Related Manuals for Kubota Z231BR-AU

Summary of Contents for Kubota Z231BR-AU

  • Page 1 OPERATOR'S MANUAL MODELS Z231BR-AU Z231KH-AU Z251BR-AU Z251KH-AU · · · 1WNAM00001A01 English (Australia) AY . A . 2 - 2 . - . AK Code No. K3014-7127-1 READ AND SAVE THIS MANUAL © PRINTED IN U.S.A. KUBOTA Corporation 2019...
  • Page 2 ABBREVIATION LIST KUBOTA Corporation is ··· Abbreviations Definitions Since its inception in 1890, KUBOTA Corporation has grown to American Petroleum Institute rank as one of the major firms in Japan. Power Take Off To achieve this status, the company has through the years...
  • Page 3 FOREWORD You are now the proud owner of a KUBOTA ZERO TURN MOWER. This machine is a product of KUBOTA's quality engineering and manufacturing. It is made of excellent materials and under a rigid quality control system. It will give you long, satisfactory service.

  • Page 4: Table Of Contents

    7.1 Stop position of the motion control lever .................... 31 7.2 Operating position of the motion control lever..................31 STOPPING THE MACHINE..........................33 PARKING THE MACHINE ..........................33 TRANSPORTING THE MACHINE........................33 1. Hydrostatic transaxle bypass rods......................33 OPERATING THE MOWER .......................35 MOWING TIPS..............................35 Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...
  • Page 5 7. Checking movable parts ..........................48 EVERY 25 HOURS ............................. 48 1. Cleaning precleaner element (except Z251BR-AU) .................. 48 2. Cleaning air cleaner element (Z231BR-AU, Z251BR-AU) ................ 49 EVERY 50 HOURS ............................. 50 1. Checking the engine start system ......................50 2.
  • Page 6 3. Replacing air cleaner element (Z231KH-AU, Z251KH-AU) ..............62 4. Changing engine oil (Z231BR-AU, Z251BR-AU) ..................63 5. Replacing engine oil filter (Z231BR-AU, Z251BR-AU) ................63 6. Replacing fuel filter (Z231BR-AU, Z251BR-AU) ..................63 7. Checking fuel lines ............................ 63 8.
  • Page 7 Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 8: Safe Operation

    • Use only implements approved by KUBOTA. Use • Pay special attention to the safety labels on the proper ballast on the front or rear of the machine to machine itself.
  • Page 9 (See Checking the engine start system on page 50 and Checking the OPC system on page 51.) • KUBOTA recommends the use of a roll-over Do not operate unless they are functioning protective structure (ROPS) and seat belt in almost correctly.
  • Page 10 • Remove obstacles such as rocks and tree limbs. machine into a trailer or truck. • Stay alert for holes in the terrain and other hidden • This machine is not allowed to be used on public hazards. Keep away from drop-offs. Uneven terrain roads. Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...
  • Page 11 [LOWER] (lower limit level) down, suddenly drop or be accidently lowered. mark. Otherwise, the battery component parts may • Consult your local recycling center or KUBOTA prematurely deteriorate, which may shorten the Dealer to learn how to recycle or get rid of waste battery's service life or cause an explosion.
  • Page 12 • To avoid the danger of exhaust fume poisoning, do not operate the engine indoors without adequate ventilation. • To reduce fire hazards, clean the machine thoroughly before storage. Dry grass and leaves around the engine and muffler may ignite. Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...
  • Page 13 SAFE OPERATION SAFETY LABELS Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...
  • Page 14 SAFE OPERATION Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...
  • Page 15 SAFE OPERATION Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...
  • Page 16 SAFE OPERATION Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...
  • Page 17 • Clean safety labels with soap and water, and dry with a soft cloth. • Replace damaged or missing safety labels with new labels from your local KUBOTA Dealer. • If a component with safety label(s) attached is replaced with a new part, make sure new label(s) is (are) attached in the same location(s) as the replaced component.

  • Page 18: Servicing Of Machine

    However, when in need of parts or major service, be sure to consult your local KUBOTA Dealer. When in need of parts, be prepared to give your dealer the product identification number (PIN)/serial number, and the ROPS, engine and mower serial numbers.

  • Page 19: Warranty

    (1) Mower identification plate (2) Mower serial number WARRANTY This machine is warranted under the KUBOTA Limited Express Warranty, a copy of which may be obtained from your selling dealer. No warranty shall, however, apply if the machine has not been handled according to the instructions given in the operator's manual, even if it is within the warranty period.

  • Page 20: Specifications

    SPECIFICATION TABLE  SPECIFICATIONS SPECIFICATIONS SPECIFICATION TABLE Model Z231BR-AU Z231KH-AU Z251BR-AU Z251KH-AU Model name GH731V-1 GH736V GH733V-1 GH750V Max. engine power *1*2 *1*3 *1*3 *1*3 kW (HP) 16.4 (22) 15.7 (21) 18.6 (25) 18.6 (25) (gross) Type Air-cooled gasoline engine Number of cylinders 2 (V-Twin) 79 ×...
  • Page 21 (temperature, humidity, and altitude). Kohler reserves the right to change product specifications, design, and standard equipment without notice and without incurring obligation. Oil amount when the oil level is at the upper level. Model RCK48P-124Z RCK54P-127ZA Suitable machine Z231BR-AU, Z231KH-AU Z251BR-AU, Z251KH-AU Mounting method Parallel linkage Adjustment of cutting height Dial gauge Cutting width mm (in.)

  • Page 22: Implement Limitations

    IMPLEMENT LIMITATIONS TERMS OF USE The KUBOTA Machine has been thoroughly tested for proper performance with implements sold or approved by KUBOTA. Use with implements below may result in malfunctions or failures of the machine, damage to other property and injury to the operator or others.

  • Page 23: Instrument Panel And Controls

    (7) Mower lift pedal........30 (13) Light switch (Z231KH-AU, Z251KH-AU) Motion control lever ........ 31 (8) Cutting height control dial ....... 35 ..............30 (3) Seat belt..........29 (9) Key switch..........24 (4) Cup holder (10) Hour meter..........26 Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 24: Mower

    MOWER  INSTRUMENT PANEL AND CONTROLS MOWER RCK48P, RCK54P Illustrated contents (1) Anti-scalp roller (front, bolt shift type) ........35 (2) Discharge deflector..............28 Discharge deflector..............36 Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 25: Mower Mounting

    ADJUSTING THE MOWER (See OPERATING THE MOWER on page 35 and ADJUSTMENT on page 67.) DISMOUNTING THE MOWER DECK (1) Lift link For dismounting the mower deck, reverse the above (2) Clevis pin, snap pin procedures. Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 26: Operating The Engine

    (1) PTO switch (A) “ENGAGED” (ON) (B) “DISENGAGED” (OFF) STARTING THE ENGINE 1. Sit on the operator's seat. 2. Apply the parking brake. To apply the parking brake: Place the parking brake lever in the “ENGAGED” position. Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 27: Throttle Lever

    Do not make further operator is sitting on the seat. attempts to start the engine until the condition is corrected. Do not jump start using another 7. Warm up the engine by running at medium speed. battery. Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 28: Stopping The Engine

    STOPPING THE ENGINE  OPERATING THE ENGINE CHECK DURING OPERATING Consult your local KUBOTA Dealer. • Do not turn the key switch to the “START” position while the engine is running. IMPORTANT : • When the temperature is below 0 ℃ (32 ℉), run...

  • Page 29: Hour Meter

    Hydraulic oil serves as transmission oil. In cold weather 6. Clamp the other cable to the negative (black, (-) or conditions, the oil may be cold with increased viscosity. neg.) terminal of the helper battery. This can cause delayed oil circulation or abnormally Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...
  • Page 30 • Use only same voltage for jump starting. • Use of a higher voltage source on the machine could result in severe damage to the machine electrical system. Use only a matching voltage source when “jump starting” a low or dead battery. Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 31: Operating The Machine

    2. Engine break-in • Do not drive the machine on streets or highways. Watch for traffic when you cross Z231BR-AU, Z251BR-AU roads or operate near roads. After the first 5 hours of operation, change the engine • Look to the rear before and when backing. Make oil.

  • Page 32: Starting The Machine

    • Make adjustments to the seat only while the machine is stopped. • Make sure that the seat is completely secured after each adjustment. • Do not allow anyone other than the driver to ride on the machine. Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 33: Light Switch

    Push the pedal to the end of the pedal stroke. To apply the parking brake: To lower the mower deck: Place the parking brake lever in the “ENGAGED” Push the pedal all the way then release the pedal to the position. desired mower deck cutting height. Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 34: Motion Control Lever

    For forward travel in a straight line, push both motion Forward and rearward movements of the motion control control levers forward equally and slowly. levers are locked when these levers are in the “NEUTRAL LOCK” position (the engine can only be started with levers in this position). Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...
  • Page 35 For forward travel to the right, push the left motion WARNING control lever further forward than the right motion To avoid serious injury or death: control lever. • The motion control lever adjustment important to ensure the machine operates properly. Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 36: Stopping The Machine

    67.) To avoid serious injury or death: We recommend that you contact your local Before leaving the operator's position: KUBOTA Dealer. • Apply the parking brake. • Lower all implements to the ground. STOPPING THE MACHINE • Shut off the engine.
  • Page 37 (1) Right side HST bypass rod (A) Operating position (B) Bypass position (H) “HOLD” 3. After moving, place both the right side and left side HST bypass rod back into the “OPERATING POSITION” hole. Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 38: Operating The Mower

    For extremely tall grass, set the cutting height at maximum cutting height for the first mowing, then reset to the desired height and mow again. Allow the grass to grow to 80 mm (3 in.), then cut off only the top inch. Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 39: Operating The Mower

    6 mm (0.25 in.) to the ground. WARNING To avoid serious injury or death: • Clear the work area of objects which might be picked up and thrown. • Do not direct the opening of the discharge deflector at bystanders, especially children, or Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 40: Pto Switch

    • Never operate the engine without heat shields or guards. 1. Sit on the operator's seat. Put on the seat belt. Make sure that the parking brake is engaged. 2. Start the engine. Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 41: Tires And Wheels

    1. Park the machine on a firm and level surface. (1) Ground (A) “INSUFFICIENT” 2. Stop the engine and apply parking brake. (B) “NORMAL” (C) “EXCESSIVE” 3. Lift the front of machine with a safe lifting device. 4. Remove the nut and the wheel bolt. Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 42: Installing The Front Caster Wheels

    1. Install the replacement wheel. 2. Install the wheel bolt and the nut. (1) Nut (2) Wheel bolt (3) Yoke 3. Tighten the nut. 48 to 56 N⋅m Tightening torque (36 to 41 lbf⋅ft 4.9 to 5.7 kgf⋅m) 4. Lower the machine. Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 43: Maintenance

     MAINTENANCE SERVICE INTERVALS MAINTENANCE SERVICE INTERVALS The following servicing tasks should be carried out on the machine at the stated running-time intervals. Z231BR-AU, Z251BR-AU Indication hour meter (hr) Ref. Items page 100 150 200 250 300 350 400 450 500 550 600 After since...
  • Page 44 This maintenance should be done every 50 hours or every 1 year if using a standard oil filter. If using a high-efficiency oil filter, it may be extended to every 100 hours or every 1 year. A genuine KUBOTA oil filter is a high-efficiency oil filter.
  • Page 45 See the Emissions Warranty Statement. – To ensure the best quality and reliability, use new KUBOTA genuine parts or their equivalents for repairs and replacement, whenever you have maintenance done. Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 46: Lubricants And Fuel

    • Oil used in the engine should have an American Petroleum Institute (API) service classification and proper SAE Engine oil according to the ambient temperatures as shown in the previous table. • Synthetic oil meeting the listed classifications may be used after 50 hours of run time. Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 47: Periodic Service

    2. Raise the operator's seat to the resting position. (1) Operator's seat Lowering WARNING To avoid serious injury or death: • Do not drop the seat when lowering it. • Watch your hands. Do not place your hands under the seat when lowering it. Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 48: Checking The Engine Oil Level

    (2) Oil level dipstick (B) “LOWER LEVEL” system. If either of these do not operate properly, contact IMPORTANT : your local KUBOTA Dealer • When using a different brand or viscosity oil immediately. from the previous one, remove all of the old Others Check the areas where pre- oil and the oil filter.

  • Page 49: Checking The Amount Of Fuel And Refueling

    • Do not mix oil with gasoline. • Tighten the fuel cap. • Do not use a fuel cap other than one approved by KUBOTA. • Do not permit dirt, trash or water to get into the fuel system. • Be careful not to spill fuel while refueling. If a spill should occur, wipe it off at once, or it may cause a fire.

  • Page 50: Checking And Cleaning The Air Intake Screen

    1. Park the machine on a flat surface, lower the implement to the ground and shut off the engine and remove the key. (1) Air intake screen (2) Engine plate 4. Checking the tire pressure WARNING To avoid serious injury or death: Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 51: Checking Movable Parts

    2. Remove the precleaner from the air cleaner Clean precleaner element, or remove as an assembly for servicing. Z231BR-AU Make sure the base and the sealing area is clean Wash the precleaner every 25 hours of operation. before reassembly is performed.

  • Page 52: Cleaning Air Cleaner Element (Z231Br-Au, Z251Br-Au)

    7. Reinstall the air cleaner cover and secure it with 2 knobs. 2. Cleaning air cleaner element (Z231BR-AU, Z251BR-AU) NOTE : • Operating the engine with loose or damaged Every 100 hours of operation or annually replace the...

  • Page 53: Every 50 Hours

    (1) Air cleaner cover following tests, do not operate the machine. (2) Air cleaner cover knob Consult your local KUBOTA Dealer. 2. Open the latch and remove the air cleaner element. • Sit on the operator's seat for all tests except for test 1.

  • Page 54: Checking The Opc System

    Test 1 (operator on the seat) • If the engine cranks in tests 1 through 4, 1. Start the engine. consult your local KUBOTA Dealer to have the 2. Do not set the parking brake. unit checked before operation. 3. Set the PTO switch to the “DISENGAGE” (OFF) position.

  • Page 55: Replacing Engine Oil Filter (Z231Br-Au, Z251Br-Au)

    NOTE : • The used oil can be drained out more easily if the engine is warm. Z231BR-AU, Z251BR-AU (1) Engine oil port (A) “UPPER LEVEL” (2) Oil level dipstick (B) “LOWER LEVEL”...

  • Page 56: Checking The Muffler And Spark Arrester (If Equipped)

    WARNING Running engines produce heat. Engine parts, especially the muffler, become extremely hot. Severe thermal burns can occur on contact. Combustible debris, such as leaves, grass, brush, and so on. can catch fire. To avoid serious injury or death: Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 57: Replacing Precleaner Element (Except Z251Br-Au)

    1. To change the used oil, remove the drain hose from the clamp, direct the hose down and remove the (Z231BR-AU, Z251BR-AU) drain plug. (See Cleaning air cleaner element (Z231BR-AU, NOTE : Z251BR-AU) on page 49.) • The used oil can be drained out more easily if the engine is warm.

  • Page 58: Cleaning Engine Shroud

    2. Check to see if the engine's cooling fins are blocked with dust and dirt. Clean them with compressed air if required. Z231BR-AU, Z251BR-AU Clean every 100hr or every 1 year whichever comes faster. Z231KH-AU, Z251KH-AU Clean every 100hr.

  • Page 59: Checking The Fuel Filter

    EVERY 100 HOURS 3. Inspect the spark plug for cracked porcelain, pitted electrodes, or other wear and damage. Replace the spark plug if necessary. Z231BR-AU (A) 0.75 mm (0.03 in.) 7. Checking the fuel filter (1) Spark plug (both sides)

  • Page 60: Checking The Battery Condition

    (3) Fuel pump (1) Fuel line (2) Pipe clamp (3) Fuel filter (1) Fuel line (A) Muffler (2) Pipe clamp (B) Carburetor 8. Checking the battery condition DANGER To avoid the possibility of battery explosion: refillable type battery, follow these instructions: Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 61: Charging The Battery

    • When exchanging an old battery with a new one, use a battery of equal specifications (as described in the following table). Reserve Cold Normal Battery Volts (V) capacity cranking charging type (min) amps rate (A) (1) Battery (+) Positive terminal U1-300 (2) Ground cable Negative terminal Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 62: Storing The Battery

    6 months in cold seasons. 1. Move the throttle lever to the “FAST” position. 9. Adjusting the throttle cable Z231BR-AU, Z251BR-AU 1. Move the throttle lever to the “FAST” position. (1) Throttle lever 2. Make sure the throttle arm (A) contacts the choke arm (B).

  • Page 63: Replacing Engine Oil Filter (Z231Kh-Au, Z251Kh-Au)

    5. Wipe the filter base surface off and apply a film of Stop the engine, correct any leaks, and allow a new oil to the gasket of the new replacement filter minute for the oil to drain down, then recheck the (Hydro- Gear part number 52114). level on the dipstick. Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 64: Changing Transaxle Fluid

    • The clutch also acts as a brake to assist in stopping 14. Re-install the transaxle fluid tank cap by hand. Be blade rotation when the PTO is switched off or the careful to not overtighten. operator presence control is interrupted. Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 65: Checking Engine Valve Clearance (Z231Kh-Au, Z251Kh-Au)

    2. Checking engine valve clearance (Z231KH-AU, Z251KH-AU) Consult your local KUBOTA Dealer for this service. EVERY AFTER 500 HOURS 1. Cleaning combustion chamber If you do not have the proper tools and/or are not mechanically proficient, consult your local KUBOTA Dealer for this service.

  • Page 66: Changing Engine Oil (Z231Br-Au, Z251Br-Au)

    Z251BR-AU) (See Changing engine oil (Z231BR-AU, Z251BR-AU) on page 51.) 5. Replacing engine oil filter (Z231BR-AU, Z251BR-AU) (See Replacing engine oil filter (Z231BR-AU, Z251BR- AU) on page 52.) 6. Replacing fuel filter (Z231BR-AU, (1) Hydraulic hose Z251BR-AU) (2) Hose clamp (3) Transaxle fluid tank (See Checking the fuel filter on page 56.)

  • Page 67: Every 4 Years

    Slow blow fuse Fuse No. Capacity Protected circuit 1. Replacing hydraulic hose Check circuit Consult your local KUBOTA Dealer for this service. 30 A against wrong battery connection 2. Replacing fuel lines 2. Checking and replacing blades Consult your local KUBOTA Dealer for this service.

  • Page 68: Replacing The Mower Belt

    To attach blades, be sure to install the cup washer 3. Remove the tension pulley, and remove the belt. between the blade and bolt head. Then tighten the bolt securely. RCK48P, RCK54P (1) Spindle holder (2) Cover (3) Blade (4) Cup washer (5) Bolt Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...
  • Page 69 4. To install a new belt, reverse the previous procedure. NOTE : • Tighten the tension pulley bolt securely from 77.6 to 90.2 N⋅m (8.0 to 9.2 kgf⋅m, 57.1 to 66.5 lbf⋅ft). (1) Tension pulley (2) Belt (3) Bolt (4) Shield Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 70: Adjustment

    • If you feel you are unable to make the following (3) Bolt (front) adjustments correctly and safely, contact your (4) Bolt (rear) local KUBOTA Dealer. Left hand side Details regarding motion control lever alignment can be found in a different section.

  • Page 71: Maximum Speed (Forward)

    23.6 to 27.4 N⋅m Tightening torque (2.4 to 2.8 kgf⋅m 17.4 to 20.2 lbf⋅ft) 2. Maximum speed (forward) Consult your local KUBOTA Dealer for this service. 3. Motion control lever alignment (1) Bolt (A) Low position (2) Flange nut (3) Tab slot...

  • Page 72: Leveling The Mower Deck (Side-To-Side)

    4. Position the right mower blade in the side-to-side position. 5. Measure from outside the blade tip to the level surface with a short ruler or leveling gauge. Reference Height of the blade at the flat surface 76 mm (3 in.) Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 73: Leveling The Mower Deck (Front-To-Rear)

    7. Check that the left side blade has the same dimensions. difference between both measurements should be less than 6 mm (0.25 in.). The front side must be lower than the rear side. 8. If the front-to-rear adjustment is not within the given tolerance, adjustment is necessary. Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...
  • Page 74 MOWER DECK LEVEL  ADJUSTMENT (1) Cutting height fine tuning bolt (2) Jam nut Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 75: General Torque Specification

    7.9-9.2 10.5-12.0 (lbf⋅ft) 110-132 160-192 (lbf⋅ft) 91.2-108 123-144 9/16 (N⋅m) 149.2-179.0 217.0-260.4 (N⋅m) 124-147 167-196 (kgf⋅m) 15.22-18.27 22.14-26.57 (kgf⋅m) 12.6-15.0 17.0-20.0 (lbf⋅ft) 150-180 220-264 (lbf⋅ft) 145-166 192-224 (N⋅m) 203.4-244.1 298.3-358.0 (N⋅m) 196-225 260-303 (kgf⋅m) 20.75-24.91 30.44-36.53 (kgf⋅m) 20.0-23.0 26.5-31.0 Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 76: Tightening Torque Chart

    (135.3 ± 11.7) (13.8 ± 1.2) NOTE : • Figure [7] on the top of the bolt indicates that the bolt is made of special material. • Before tightening, check the figure on top of the bolt. (1) Scale Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 77: Storage

    8. Store the machine in a dry place sheltered from rain. Cover the machine with a vinyl tarp. 9. Moisture content in most grasses can damage the mower and grass catcher if these components are not properly cleaned after use. Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 78: Troubleshooting

    Replace fuel and the fuel filter. • Water or dirt in the fuel system. • Replace fuel and see your KUBOTA Dealer. • Fuel hose or fuel filter clogged or damaged. • Clean or replace fuel lines and see your KU- BOTA Dealer.
  • Page 79 Spark plug damaged. • Adjust the spark plug gap or replace it. • Faulty spark plug. • Replace the spark plug. • Carburetion problem. • See your KUBOTA Dealer. If you have any questions, contact your local KUBOTA Dealer. Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 80: Battery Troubleshooting

    • Charging system • Contact your local trouble. KUBOTA Dealer. If you have any questions, contact your local KUBOTA Dealer. MACHINE TROUBLESHOOTING Symptom (if) Cause Remedy The machine operation is not • The hydrostatic transaxle fluid is insufficient. • Fill oil.

  • Page 81: Mower Troubleshooting

    MOWER TROUBLESHOOTING Symptom (if) Cause Remedy Blades do not rotate. • The PTO system is not normal: • Consult your local KUBOTA Dealer. PTO system malfunctioning. • The PTO system is normal: • Replace. broken mower belt. Mower belt slipping.
  • Page 82 Slow down. • Debris wrapped around mower spindles. • Clean the mower. • Front of deck too low. • Adjust the mower deck. (See MOWER DECK LEVEL on page 68.) If you have any questions, contact your local KUBOTA Dealer. Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

  • Page 83: Index

    (Z231KH-AU, Z251KH-AU)....60 adjusting..............68 engine shroud cleaning..............55 engine start system checking..............50 battery engine valve charging..............58 checking clearance (Z231BR-AU, Z251BR-AU)... 63 checking condition..........57 checking clearance (Z231KH-AU, Z251KH-AU)... 62 jump starting............26 storing..............59 troubleshooting............77 blades front caster wheels checking..............64 installing..............
  • Page 84 73 mower lift pedal............30 transaxle fluid mowing tips..............35 changing..............61 muffler checking level............47 checking............53,63 transaxle oil filter replacing..............60 transmission oil warming up in the low temperature range.....26 OPC system checking..............51 operator's seat.............29 lowering..............44 warranty..............16 raising..............44 Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...
  • Page 85 38 Z231BR-AU,Z231KH-AU,Z251BR-AU,Z251KH-AU...

This manual is also suitable for:

Z231kh-auZ251br-auZ251kh-au

Table of Contents