John Deere

OMM131726

Issue F7

Commercial Walk-Behind Mowers

HD45 and HD75

Serial No. (010001 - )

Introduction

Safety Signs

Controls

Operating Machine

Replacement Parts

Service Machine Safely

Service Interval Chart

Service Engine

Service Transmission

Service-Brakes and Drive Wheels

Service Mower

Avoid Injury From Contacting Blades

Grease

Lubricating Mower Spindles (36-Inch Decks)

Lubricating Mower Spindles (48/54-Inch Decks)

Lubricating Mower Deck Idler Arm (48/54-Inch Decks)

Replacing Clutch To Mower Deck Drive Belt (36-Inch Decks)

Replacing Mower Deck Timing Belt (36-Inch Decks)

Quick Check On Mower Deck Timing (36-Inch Decks)

Adjusting Mower Deck Timing (36-Inch Decks)

Adjusting Timing Belt Tension (36-Inch Decks)

Replacing Clutch To Mower Deck Drive Belt (48/54-Inch Decks)

Level Mower Deck (Front-To-Rear)

Level Mower Deck (Side-to-Side)

Inspecting and Replacing Mower Blades

Sharpening Blades

Balancing Blades

Service Electrical

Service Miscellaneous

Troubleshooting

Storing Machine

Assembly

Specifications

Warranty

John Deere Service Literature

Quality Doesn't End When You Invest In A Deere

Copyright© Deere & Company

All Manuals Close Window

Service Mower

Avoid Injury From Contacting Blades


MIF

c CAUTION: Avoid injury! To avoid injury, before you unplug, adjust or service mower:

- DISENGAGE PTO to stop mower blades.

- Wait for mower blades to STOP.

- LOCK the part brake.

- STOP the engine.

Remove the key.

Clean unit by removing all grass clippings and dirt from mower deck.

Grease

Use grease based on the expected air temperature range during the service interval.

The following greases are preferred:


TS1417

· John Deere Moly High Temperature EP Grease.

· John Deere High Temperature EP Grease.

· John Deere GREASE-GARD.

Other greases may be used are:

· SAE Multipurpose EP Grease with 3 to 5 percent molybdenum disulfide.

· SAE Multipurpose EP Grease.

· Greases meeting Military Specification MIL-G-10924C may be used as arctic grease.

Lubricating Mower Spindles (36-Inch Decks)

Service Interval:

· Lubricate at least every 25 hours of operation.


M92108

Lubricate mower spindles grease fittings (A) with John Deere Moly High Temperature EP Grease or an equivalent.

Lubricating Mower Spindles (48/54-Inch Decks)

Service Interval:


M85228

· Lubricate at least every 25 hours of operation.

Lubricate mower spindles grease fittings (A) with John Deere Moly High Temperature EP Grease or an equivalent.

Lubricating Mower Deck Idler Arm (48/54-Inch Decks)

Service Intervals:

· Lubricate at least every 25 hours of operation.


M92089

1. Remove deck shield (A).


M92125

2. Loosen three belt shield screws (B).

3. Remove left belt shield (C).


M92001

4. Lubricate mower deck idler arm grease fitting (D) with John Deere Moly High Temperature EP Grease or an equivalent.

5. Install belt shield (C) and tighten screws (B).

6. Install deck shield (A).

Replacing Clutch To Mower Deck Drive Belt (36-Inch Decks)

c CAUTION: Avoid injury! Be careful when removing old belt and installing new belt. Possible pinch point between idler and PTO clutch sheave.

NOTE: To create more access and ease the installation of the drive belt, move the mower deck to a 2-Inch cutting height.


M92108

1. Remove deck shield (A).


M92109

2. Pull spring loaded idler (B) to loosen belt tension.

3. Remove clutch to mower deck drive belt (C).

4. Install new drive belt (C) over PTO clutch sheave between the idler arm sheave and idler spring.

5. Make sure drive belt is properly routed around the spring loaded idler (B) for proper belt tension.


M86322

6. If necessary, see label on mower deck.

7. Install belt shield.

Replacing Mower Deck Timing Belt (36-Inch Decks)

1. Remove the clutch to mower deck drive belt (A). (See Replacing Clutch To Mower Deck Drive Belt (36-Inch Decks) in this section.)


M92118

2. Loosen timing belt tension:

· Loosen locknut (B) to the ends of the threads.

· Loosen two locknuts (C).

· Tension arm (D) will loosen belt tension.

3. Remove two locknuts (C) and tension arm (D).

4. Remove mower deck timing belt (E).


M85254

5. Position mower blades (F) and (G) 90° from each other.

6. Install new mower deck timing belt (E).

7. Install tension arm. Install and turn two locknuts (C) down partway to allow movement of tension arm (D). Inspect tension arm (D), tension arm must be free to slide.

· Check that blades are still timed (90° from each other).

· Rotate blades to make sure they do not contact each other.


M86322

· If necessary, see label on mower deck.

8. Adjust belt tension:

NOTE: Lock nuts (C) must be loose to allow movement of idler arm during adjustment of lock nut (B).


M92119


M86345

· Tighten lock nut (B) to compress spring (H). Tighten lock nut until the spring side of washer (I) is even with adjustment rod end (J).

NOTE: Locknuts (C) must be tightened to prevent idler movement during mower operation. If idler is free to move, blades will become out of time.

· Tighten both lock nuts (C) to approximately 55 N·m (40 lb-ft.).

9. Install the clutch to mower deck drive belt. (See Replacing Clutch To Mower Deck Drive Belt (36-Inch Decks) in this section.)

Quick Check On Mower Deck Timing (36-Inch Decks)

IMPORTANT: Avoid damage! - Due to belt stretching, the tension on the timing belt should be adjusted after the first 25 hours of use and at every 100 hour interval.

- Tension on the timing belt should be adjusted after a major blade impact.

- Due to mower blade overlap, the mower blades will eventually collide if the timing belt is not adjusted on a regular basis.


1. Remove mower deck shield.


M92109

2. Note the position of the drain holes (A) in the spindle sheaves. These drain holes are in alignment with the mower blades.


M85254

3. A properly timed mower deck must have the mower blades (B) and (C) at 90° from each other.

4. For a quick check on mower deck timing, sheave drain holes (A) should be approximately 90° from each other.

5. If necessary, adjust the mower deck timing. (See Adjusting Mower Deck Timing in this section.)

6. If necessary, see Adjusting Timing Belt Tension (36-Inch Decks) in this section.

7. Install mower deck belt shield.

Adjusting Mower Deck Timing (36-Inch Decks)

1. Remove mower deck shield.


M92118

2. Loosen timing belt tension:

· Loosen locknut (A) to the ends of the threads.

· Loosen two lock nuts (B).

· Tension arm (C) will loosen belt tension. Inspect tension arm (C). Tension arm must be free to slide.


M85254

3. Position mower blades (D) and (E) 90° from each other. If necessary, reposition mower blades:

· Remove two lock nuts (B) and tension arm (C).

· Slip timing belt off of one sprocket.

· Reposition mower blades.

· Install timing belt.

· Install tension arm and two lock nuts. Tension arm must be free to slide.

· Check that blades are still timed (90° from each other).

· Rotate blades to make sure they do not contact each other.

4. Adjust belt tension:

NOTE: Lock nuts (B) must be loose to allow movement of idler arm during adjustment of lock nut(A).

Lock nuts (B) must be tightened to prevent idler movement during mower operation. If idler is free to move, blades will become out of time.


M86345

· Tighten lock nut (A) to compress spring (F). Tighten lock nut until the spring side of washer (G) is even with adjustment rod end (H).


M92119

5. Tighten both lock nuts (B) to approximately 55 N·m (40 lb-ft.).

6. If necessary, see label on mower deck.

7. Install deck shield.

Adjusting Timing Belt Tension (36-Inch Decks)

IMPORTANT: Avoid damage! Due to belt stretching, the tension on the timing belt should be adjusted after the first 25 hours of use and at every 100 hour interval.

Tension on the timing belt should be adjusted after a major blade impact.

Due to mower blade overlap, the mower blades will eventually collide if the timing belt is not adjusted on a regular basis.



M92108

1. Remove deck shield (A).


M92118

2. Check the position of the drain holes (B) in the spindle sheaves. These drain holes are in alignment with the mower blades. If drain holes are not perpendicular to each other, the mower blades will need to be repositioned, see Adjusting Mower Deck Timing (36-Inch Decks) in this section.


M92118

3. Loosen timing belt tension:

· Loosen two lock nuts (C).

· Tension arm (D) will move due to spring force.

· Inspect tension arm. Tension arm must be free to slide under lock nuts (C).

4. Adjust belt tension:

NOTE: Lock nuts (C) must be loose to allow movement of idler arm during adjustment of lock nut (E).

Lock nuts (C) must be tightened to prevent idler movement during mower operation. If idler is free to move, blades will become out of time.


M86345

· Tighten lock nut (E) to compress spring (F). Tighten lock nut until the spring side of washer (G) is even with adjustment rod end (H).

5. Tighten both lock nuts (C) to approximately 55 N·m (40 lb-ft.)

6. If necessary, see label on mower deck.

7. Install deck shield.

Replacing Clutch To Mower Deck Drive Belt (48/54-Inch Decks)

c CAUTION: Avoid injury! Be careful when removing old belt and installing new belt. Possible pinch point between idler and PTO clutch sheave.


M92089

1. Remove deck shield (A).


M92082

2. Pull spring loaded idler (B) to loosen belt tension.

3. Remove and replace clutch to mower deck drive belt (C).

4. Make sure drive belt is properly routed around the spring loaded idler (B) for proper belt tension.


M86340

5. If necessary, see label on mower deck.

6. Install deck shield.

Level Mower Deck (Front-To-Rear)

c CAUTION: Avoid injury! Before adjusting the mower deck, STOP the engine

Blades may have sharp edges. Wear heavy gloves or use a rag to protect hands.

NOTE: Before checking mower deck front to rear level, check mower deck for the correct combination of cut height adjustments. See Adjusting Mower Deck Height in the Operating section.

1. Park mower on a hard level surface.

2. Check tire pressure: 100-200 kPa (15-28 psi).

3. Raise mower deck to the highest cutting position. Check for:

· Blade sharpness.

· Blade damage.

· Bent blades.

NOTE: Use a short ruler or leveling gauge (B). Order gauge from your John Deere Dealer.


M40137

4. Position left mower blade in the horizontal position shown.

5. Measure from left front blade tip to floor. Turn blade 180° and measure from left rear tip to floor: Distance (A).

6. Repeat Steps 4 and 5 for right blade.

7. Distance (A) at rear of blade should be 3-6 mm (1/8-1/4 in.) more than Distance (A) at front of blade.

Level mower deck (front to rear) using mower deck attaching hardware or caster wheel washers.

8. Mower deck attaching hardware:

· Remove mower deck shield.


M92081

· Loosen mower deck to power unit attaching hardware (C).

· Level deck by rotating power unit with respect to the mower deck and tighten attaching hardware.

· Tighten locknuts to 140 N·m (105 lb-ft.).

NOTE: Caster wheel washers should be used as a fine tune adjustment for front to rear leveling.

Always adjust left and right caster wheels equally, when adjusting level front to rear.

· Install mower deck shield.

9. Caster wheel washers:

· Raise and block one side of mower deck 150 mm (6 in.).


M92072

· Remove snap ring (D).

· Remove caster wheel from mower.

· Move top washer (E) to bottom position to RAISE front of mower, OR move washer (F) from bottom to top to LOWER front of mower.

· Install snap ring.

· Remove block. Lower mower.

10. Check mower level. (Repeat Steps 4 and 5).

Level Mower Deck (Side-to-Side)

c CAUTION: Avoid injury! Before adjusting the mower, STOP the engine.

Blades may have sharp edges. Wear heavy gloves or use a rag to protect hands.

NOTE: Before checking mower deck side-to-side level, check mower deck for the correct combination of cut height adjustments. See Adjusting Mower Deck Height in the Operating section.

1. Park mower on a hard level surface.

2. Check tire pressure: 100-200 kPa (15-28 psi).

3. Raise mower deck to the highest cutting position. Check for:

· Blade sharpness.

· Blade damage.

· Bent blades.

NOTE: Use a short ruler or leveling gauge (B). Order gauge from your John Deere dealer.

4. Position left mower blade into a sideways (horizontal) position.


M40137

5. Measure from left blade tip to floor. Distance (A).

6. Turn the right mower blade to the same sideways (horizontal) position. Measure distance (A) from tip of blade to the floor.

7. Distance (A) should be the same on each side 3 mm (1/8 in.)


M92072

8. If a side-to-side mower deck adjustment is needed, adjust caster wheel washers:

· Raise and block one side of mower 150 mm (6 in.).

· Remove snap ring (C).

· Remove wheel from mower.

· Move top washer (D) to bottom position (E) to lower wheel.

· Install snap ring.

· Remove block. Lower mower.

9. Check mower level. (Repeat steps 4-7).

Inspecting and Replacing Mower Blades

c CAUTION: Avoid injury! DO NOT work under a raised mower unless it is safely supported.

Blades are sharp and could cause personal injury.

Before handling mower blades, wear heavy gloves or wrap blade with a rag.

IMPORTANT: Avoid damage! When replacing mower blades always use genuine John Deere Service Parts.


1. Raise and block front of mower.


M85259

2. Inspect mower blades (A):

· Mower blades should be sharp and free of any damage.

· Replace mower blades as required.

3. Remove and replace damaged blade(s):

· Remove blade bolt (B), washer (C) and blade (A). Discard any blade that has been damaged due to a serious impact.

· When installing a new blade, put cup-side of washer (C) against blade.

· 48/54-Inch Deck: Tighten blade bolts to 68 N·m (50 lb-ft.).
· 36-Inch Deck: Tighten blade bolts to 81 N·m (60 lb-ft.). If new mower blades are installed on a 36-Inch Deck, see Adjusting Mower Deck Timing (36-Inch Decks) in this section.

4. Remove supports and lower mower.

Sharpening Blades

c CAUTION: Avoid injury! To avoid injury, wear goggles and gloves when you handle blades.


MIF

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

2. Keep original bevel (A) when you grind.

3. Blade should have 0.40 mm (1/64 in.) cutting edge (B).

Balancing Blades

c CAUTION: Avoid injury! To avoid injury, wear goggles and gloves when you handle blades.

1. Clean blade.


MIF

2. Put blade on nail in vise or on vertical wall stud. Turn blade to horizontal position.

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

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