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Service Mower


Rotating the Front Mower Deck

Rotate for Service

1. Stop machine on a level surface.

2. Lock park brake.

3. Raise front mower deck completely.

4. Stop engine and remove the key.


MX3718

5. Remove retaining ring (A) from hanger pin (B).

NOTE: To ensure deck can be returned to its original cutting height, note hole location in the adjustment plate before removing the hanger pin.

6. Remove hanger pin from hole in adjustment bracket. (C).

7. Install retaining ring to hanger pin for temporary storage.

8. Repeat at opposite side of mower deck.


MX3719

9. Grasp deck handle (D) and rotate mower deck rearward to the ground.


MX3722

10. Remove retaining ring (E) from service lockout rod (F).

11. Remove service lockout rod from mower lift arm (G).


MX3723

12. Insert service lockout rod (F) into hole in deck height adjustment bracket (C). Secure with retaining ring (E).

13. Repeat at opposite side of mower deck.

Rotate for Operation

1. Remove retaining ring from service lockout rod.

2. Remove service lockout rod from hole in deck height adjustment bracket.

3. Insert service lockout rod into hole in mower lift arm. Secure with retaining ring.

4. Repeat at opposite side of mower deck.

5. Remove retaining ring from hanger pin.

6. Rotate mower deck forward.

7. Insert hanger pin into original hole in adjustment plate. Secure with retaining pin.

8. Repeat at opposite side of mower deck.

9. Start engine.

10. Lower front mower deck completely.

Removing and Installing Belt Shields

c CAUTION: Avoid injury! Rotating parts can catch fingers, loose clothing, or long hair. Wait for engine and all moving parts to stop before leaving operator’s station to adjust or service machine.

Front Deck Shields


MX3720

1. Rotate front mower deck for service. Do not secure service lockout rods (A) to the adjustment plates.

2. Remove threaded knobs (B) securing belt shields (C) and (D) to mower deck.

3. Lift each belt shield up off of the attaching bolts. Slide shields out from between mower lift arms (E) and mower deck.

4. Install the threaded knobs onto the attaching bolts during servicing of the deck.

5. Installation is the reverse of removal.

6. Rotate mower deck for operation.

Side Deck Shields

1. Park the machine safely. (See Parking Safely in SAFETY section.)


MX3721

2. Remove threaded knobs (A) securing belt shields (B) and (C).

3. Lift each belt shield up off of the attaching bolts.

4. Install the threaded knobs onto the attaching bolts during servicing of the deck.

5. Installation is the reverse of removal.

Adjusting Mower Deck Drive Belt Tension


MX3720A, MX3721A

Picture Note: Front deck shown upper, side deck shown lower.

1. Remove belt shield (A) from mower deck.

2. Lower mower deck.


MX22724

Picture Note: Front deck shown, side deck similar.

3. Loosen hex nuts (D) and (E).

4. Adjust nut (C) until tension indicator hole (G) becomes visible on the outside of retaining plate (F) as shown.

5. Tighten hex nuts (D) and (E) to 60 N•m (81 lb-ft).

Removing and Installing Front Mower Deck Drive Belt

Front Belt Removal

1. Remove belt shields from mower deck.

2. Lower mower deck completely.


MX22724

3. Loosen hex nuts (A) and (B).

4. Loosen nut (C) until all spring tension is removed.

5. Remove tension rod (D), spring (E), and spring retainer (F).

c CAUTION: Avoid injury! Rotating parts can catch fingers, loose clothing, or long hair. Wait for engine and all moving parts to stop before leaving operator’s station to adjust or service machine.


MX22726

6. Remove four cap screws (G).

7. Remove sheet metal plate (H).


MX22727

8. Remove four hex nuts (I) and mower deck spindle sheave (J).


MX22725

9. Remove three cap screws (K), three washers, and three upper rubber isolator halves.

10. Remove nut (M), washer, and rubber isolator half from carriage bolt.

NOTE: The lower halves of the rubber isolators are fit into the deck side of the cast mounting plate. Washers are glued to the bottom of each isolator. Ensure rubber isolators and washers remain installed in the mounting plate during installation of the mounting plate to the mower deck.

11. Slide cast mounting plate (N) towards mower deck spindle (O) to remove it from the mounting brackets (L).


MX22728

12. Remove drive belt (P) from mower deck sheaves.

Front Belt Installation

NOTE: Belt routing diagram is affixed to mower deck.


MX22728

1. Route drive belt (A) around mower deck sheaves as shown.

NOTE: The lower halves of the rubber isolators are fit into the deck side of the cast mounting plate. Washers are glued to the bottom of each isolator. Ensure rubber isolators and washers remain installed in the mounting plate during installation of the mounting plate to the mower deck.


MX22725

2. Position cast mounting plate (B) onto mounting brackets (C) so that belt is routed properly around drive motor sheave. Install carriage bolt, upper isolator half, washer, and nut (E). Do not tighten.

3. Install 3 upper isolator halves, washers, and cap screws (D). Tighten cap screws (D) and nut (E) to 47 N•m (35 lb-ft).


MX22727

4. Install mower deck spindle sheave (G) and four hex nuts (F). Route belt around spindle sheave.


MX22726

5. Install sheet metal plate (I) and route belt around tensioner sheave (H) and idler sheave (K). Install four cap screws (J). Tighten cap screws to 81 N•m (60 lb-ft).


MX22724

6. Ensure spring retainer (M) and spring (L) are installed on tension rod (N). Install tension rod into retaining plate (Q) on mower deck.

7. Adjust drive belt to proper tension.

8. Tighten hex nuts (O) and (P) to 81 N•m (60 lb-ft).

9. Move the drive belt by hand to turn the sheaves. Ensure belt motion is smooth and sheaves do not rub on deck surfaces.

Removing and Installing Side Mower Deck Drive Belt

Side Belt Removal

1. Lower mower deck completely.

2. Remove belt shields from mower deck.

3. Release the drive belt tension completely.

c CAUTION: Avoid injury! Rotating parts can catch fingers, loose clothing, or long hair. Wait for engine and all moving parts to stop before leaving operator’s station to adjust or service machine.


MX3732

Picture Note: Mower deck shown removed for clarity.

4. Remove drive belt (A) from sheave (B).


MX3733

5. Remove drive belt (A) from sheave (C) by twisting the belt and sliding it between belt shield support bracket (D) and the sheave.


MX22736

6. Remove two cap screws (E), washers, and rubber isolators from motor plate (G). Remove two cap screws (F), washers, rubber isolators, and hex nuts.

NOTE: The lower halves of the rubber isolators are fit into the deck side of the cast mounting plate. Washers are glued to the bottom of each isolator. Ensure rubber isolators and washers remain installed in the mounting plate during installation of the mounting plate to the mower deck.


MX3735

7. Slide motor plate (G) forward so sheave on bottom side clears motor plate mounting bracket (H).

8. Lift motor plate off mounting brackets and set it aside.

9. Remove drive belt (A) from deck.

Side Belt Installation

NOTE: Belt routing diagram is affixed to mower deck.


MX22737

1. Route drive belt (A) as shown.

NOTE: The lower halves of the rubber isolators are fit into the deck side of the cast mounting plate. Washers are glued to the bottom of each isolator. Ensure rubber isolators and washers remain installed in the mounting plate during installation of the mounting plate to the mower deck.


MX3737, MX3738

2. Position motor plate (B) onto motor plate mounting brackets (C) so drive belt is routed properly around sheaves (D) and (E).

3. Remove drive belt from sheave (F).

4. Slide drive belt between belt shield support bracket (G) and sheave (H). Ensure proper positioning of belt in the belt grooves.


MX3739

5. Make sure spring retainer (I) and spring (J) are installed on tension rod (K). Insert tension rod into retaining plate (L) on mower deck.


MX22736

6. Install two isolators, washers, and cap screws (M). Install two isolators, washers, cap screws, and hex nuts (N). Do not tighten completely.

7. Install drive belt onto sheave (F).

8. Tighten cap screws (M and N) to 47 N•m (35 lb-ft).

9. Adjust drive belt to proper tension.

10. Move the drive belt by hand to turn the sheaves. Make sure belt motion is smooth and sheaves do not rub on deck surfaces.

Removing and Installing Blades

1. Stop machine on a level surface.

2. Lock park brake.

3. Raise mower decks completely.

4. Stop engine and remove the key.

5. Rotate front mower deck for service if blades on front deck will be removed.

c CAUTION: Avoid injury! Mower blades are sharp. Always wear gloves when handling mower blades or working near blades.

6. Insert wooden block between end of blade and edge of deck to prevent blade from turning while removing attaching hardware.


MX3729

7. Remove bolt (A), washer (B), and blade (C) by turning the bolt counterclockwise until removed. Repeat for all blades requiring service.

8. Inspect the blades for damage. Replace all damaged blades.

9. Sharpen dull blades.

10. Clean blades, spindles, and hardware.

11. Balance the blades.

12. Install blade onto mower deck spindle with wings of blade facing up.

IMPORTANT: Avoid damage! Make sure cupped side of concave washer is positioned against the mower blade or blade could be damaged.


13. Install blade bolt and washer with the cupped side of washer against the blade. Tighten blade bolt to 122 N•m (90 lb-ft). Repeat for other blades.

14. Lower mower decks completely.

Sharpening Blades

c CAUTION: Avoid injury! Mower blades are dangerous!

• Always wear gloves while working on blades.

• Always wear safety eye protection when grinding.

• Sharpen blades with grinder, hand file, or electric blade sharpener.


MIF

• Keep original bevel (A) when grinding.

• Blade should have 0.40 mm (1/64 in.) cutting edge (B) or less.

• Balance blades before installing.

Balancing Blades

c CAUTION: Avoid injury! Mower blades are sharp. Always wear gloves when handling mower blades or working near blades.

1. Clean blade.


M61524

2. Put blade on nail in a vise. Turn blade to horizontal position.

3. Check balance. If blade is not balanced, heavy end of blade will drop.

4. Grind bevel of heavy end. Do not change blade bevel.