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Service Mower


Grease

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

The following greases are PREFERRED:

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.


TS1417

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

Servicing Mower Blade

c CAUTION: Avoid injury! Be careful, sharp edges on mower blades. Always wear gloves when
handling mower blades.

Removing Mower Blade


M88136

1. Raise mower deck to gain access to mower blades. If necessary, remove mower deck.

2. Using a wooden block, prevent mower blades from spinning.

3. Loosen mower blade cap screw.

4. Remove mower blade assembly; cap screw (A), hardened washer (B), blade washer (C), and blade (D).

5. Inspect blade; sharpen/balance or replace as necessary.

Installing Mower Blade


M88137

1. Lightly lubricate cap screw threads with a general purpose grease or oil. This lubrication is to prevent rusting and seizing.

2. Position mower blade (D) with the cutting edge towards the ground onto the mower spindle.

3. Install blade hardware; blade washer (C) with cup side toward the blade, hardened washer (B) and cap screw (A).

4. Tighten cap screw (A) by hand until mower blade is in full contact (fully seated) with spindle.

5. With mower blade blocked, to prevent spinning, tighten cap screw (A) to 68 - 79 Nm (50 - 58 lb-ft).

Sharpening Blades

c CAUTION: Avoid injury! When sharpening blade, wear goggles and gloves.

IMPORTANT: Avoid damage! Balance blade after you sharpen it. Unbalanced blade may cause excessive vibration.


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


M61830

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

Balancing Blades

c CAUTION: Avoid injury! Wear gloves when you handle blade.


M61524

1. Clean blade.

2. Put blade on nail in vise or on vertical wall stud.

3. Turn blade to HORIZONTAL position.

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

5. Grind bevel of heavy end.

6. Do not change blade bevel.

Check Blade


M40137

1. Raise mower to highest setting: Setting 4.

Check for blade sharpness and blade damage.

Check for bent blade. (Use leveling gauge (A) or short ruler.)

Measure from blade tip to ground -Dimension (B).

Turn blade 180 degrees.

Measure opposite blade tip for Dimension (B).

Difference between Dimension (B) on both blade tips MUST NOT be more than 6 mm (1/4-in).

Install new blade if needed.

Check Adjustment of Mower Engagement Rod (PTO)


M74349

1. Move PTO lever completely forward.

2. Raise mower to highest setting: Setting 4. Nipples on rod (A) should pull away from PTO bracket (B).

3. Move PTO lever completely rearward.

4. Lower mower to lowest setting:
Setting 1. Nipples should touch PTO bracket.

5. If nipples on rod do not pull away from PTO bracket when mower is in highest setting, see Adjusting Mower Engagement Rod (PTO) in this section.

6. If nipples on rod do not touch PTO bracket when mower is in lowest setting, see Adjusting Mower Engagement Rod (PTO) in this section.

Adjusting Mower Engagement Rod (PTO)


M74350

1. Move PTO lever completely rearward.

2. Lower mower to lowest setting: Setting 1.

3. Loosen nut (A).


M74351

4. Pull engagement rod (B) forward until it is at front of slot (C).

5. Tighten nut.

6. Move PTO lever completely forward.

7. Raise mower to highest setting: Setting 4. Nipples on rod (D) should pull away from PTO bracket (E).

8. Move PTO lever completely rearward.


M74353

9. Lower mower to lowest setting: Setting 1. Nipples should touch PTO bracket.

10. PTO engagement rod is in proper adjustment when:

Nipples pull away from bracket when PTO lever is completely forward and mower is at highest setting: Setting 4.

c CAUTION: Avoid injury! If brake arm cannot be adjusted to touch belt when PTO lever is completely rearward, see your John Deere dealer.


M74353

Brake arm (F) touches belt when PTO lever is completely rearward and mower is at lowest setting: Setting 1.

Restoring Ground-Speed of (SX85) Riding Mower

Your (SX85) riding mower ground-speed is pre-set at the factory. However, as the riding mower is used, the primary drive belt will wear and stretch slightly which will restrict your riding mower from obtaining maximum ground-speed. If desired, speed may be restored by following steps listed below.

1. STOP engine.

2. Put shift lever in FORWARD position.

3. Check the amount of free play in the accelerator pedal by applying moderate hand pressure to the top of the accelerator pedal until the pedal becomes harder to push.


M74453

4. Measure distance from accelerator pedal to edge of slot in riding mower platform:


M74452

If Dimension (A) equals 38 mm (1-1/2-in.) or more, idler arm can be adjusted.

If Dimension (A) is less than 38 mm (1-1/2-in.) DO NOT make idler arm adjustment.


M74558

5. Adjust idler arm by doing the following:

Remove bolt (A).

Loosen bolt (B) in idler arm (C).

Push idler arm toward center of unit and install bolt (removed above) into alternate hole (D).

Tighten bolts.

6. Test adjustment:

IMPORTANT: Avoid damage! If riding mower does not completely STOP when foot is removed from accelerator pedal, be prepared to STOP riding mower by applying brake and turning key to OFF position.


Test riding mower in an open area.

Start engine.

IMPORTANT: Avoid damage! If riding mower does not STOP, idler arm MUST BE returned to its original position. See your John Deere dealer for any further speed adjustments.


Put shift lever in FORWARD position.

Drive riding mower forward and remove foot from accelerator pedal. Riding mower MUST STOP.

Checking Drive Belts (All)


M74411

1. Lower mower deck to the lowest setting: Setting 1.

2. Check belts for wear and damage.

3. Clean drive belt area with water or air pressure.

If drive belt needs to be replaced, (See Removing Mower Belt in this section.)

Removing Mower Belt (GX85)


M47735

1. Pull PTO lever completely rearward.

2. Put mower in the highest setting: Setting 4.

3. Remove two nuts (A), carriage
bolt (B) and belt guides (C).


M74482

4. Remove mower belt (D) from lower part of engine sheave (E).

5. Put mower in the lowest setting: Setting 1.

6. Remove spring locking pin (F) from mower draft link (G). Remove draft link from mower.

7. Put mower in the highest setting: Setting 4.

NOTE: Mower deck removed from riding mower for clarity. It does not have to be removed to change mower belt.


M74338

8. Loosen nut (H) and pull bracket (I) away from belt.


M74339

9. Remove belt (J) from V-idler (K) and flat idler (L).


M74340

10. Loosen nut (M) and pivot belt guide (N) away from belt.

11. Remove belt from sheave (O) by pushing against brake arm (P).

Installing Mower Belt (GX85)

NOTE: Mower deck removed from riding mower for clarity. It does not have to be removed to change mower belt.

1. Push PTO lever completely forward.


M74340

2. Pull belt between sheave (A) and brake arm (B).

3. Pivot belt guide (C) against belt until there is approximately 1 mm (1/16-in.) clearance.

4. Tighten nut (D).


M74339

5. Install belt (E) on V-idler (F) and flat idler (G).


M74338

6. Pivot belt guide (H) against belt until there is approximately 1 mm (1/16-in.) clearance.

7. Tighten nut (I).


M74482

8. Put mower in the lowest setting: Setting 1.

9. Install draft link (K) on mower with spring locking pin (J).

10. Push PTO lever completely rearward.


M47735

11. Install mower belt (L) on lower part of engine sheave (M).

12. Install belt guides (N) with nuts (O) and carriage bolt (P).

13. Tighten nuts.

Removing Mower Belt (SX85)


M40561

1. Pull PTO lever completely rearward.

2. Put mower in highest setting: Setting 4.

3. Loosen nut (A) and move rear belt guide (B) away from engine sheave.

4. Remove nut (C) and front belt guide (D).


M74560

5. Remove mower belt (E) from engine sheave.

6. Put mower in lowest setting: Setting 1.

7. Remove spring locking pin (F) from mower draft link (G). Remove draft link from mower.

8. Put mower in highest setting: Setting 4.

NOTE: Mower deck removed from riding mower for clarity. It does not have to be removed to change mower belt.


M74338

9. Loosen nut (H) and pull bracket (I) away from belt.


M74339

10. Remove belt (J) from V-idler (K) and flat idler (L).


M74340

11. Loosen nut (M) and pivot belt guide (N) away from belt.

12. Remove belt from sheave (O) by pushing against brake arm (P).

Installing Mower Belt (SX85)

NOTE: Mower deck removed from riding mower for clarity. It does not have to be removed to change mower belt.


M74340

1. Push PTO lever completely forward.

2. Pull belt between sheave (A) and brake arm (B).

3. Pivot belt guide (C) against belt until there is approximately 1 mm
(1/16-in.) clearance.

4. Tighten nut (D).


M74339

5. Install belt (E) on V-idler (F) flat idler (G).


M74338

6. Pivot belt guide (H) against belt until there is approximately 1 mm (1/16-in.) clearance.

7. Tighten nut (I).


M74560

8. Put mower in lowest setting: Setting 1.

9. Install draft link (J) on mower with spring locking pin (K).


M40561

10. Put mower in highest setting: Setting 4.

11. Install mower belt (L) on engine sheave.

IMPORTANT: Avoid damage! Belt guides MUST NOT rub on engine sheave. (See Checking and Adjusting Drive Belt Guides in this section.)



M40561

12. Install front belt guide (M). Make sure belt guide has approximately 1.6-3.2 mm (1/16-1/8-in.) clearance to upper part of engine sheave.

13. Install nut (N) and tighten.

14. Move rear belt guide (O) until there is approximately 1.6-3.2 mm (1/16-1/8-in.) clearance to upper part of engine sheave.

15. Tighten nut (P).

Preparing Riding Mower for Removal of Drive Belts (All)

c CAUTION: Avoid injury! Engine SHOULD NOT be running during this procedure.

Before removing drive belts, do the steps listed below to prepare riding mower.

1. LOCK park brake.

2. Lower mower to lowest setting: Setting 1.

3. Block front tires.

4. Lift rear of riding mower with safe lifting device.

5. Put cement or wood blocks under rear tires.

Removing Drive Belt (GX85)

Before removing drive belt, study illustration below.


M74459

A - Flat Idler

B - Jacksheave

C - Flat Idler

D - Drive Sheave

E - Drive Belt


M47734

1. Lock park brake.

2. Remove two nuts (F).

3. Remove carriage bolt (G) and belt guides (H).


M47736

4. Remove drive belt (I) from upper part of engine sheave (J).

5. Remove belt from drive sheave (K).


M47736

6. Loosen nut (L) on idler (M) move belt guide (N) away from belt. Remove belt from idler.


M47736

7. Loosen and remove nut (O) on idler (P) and remove belt guide (Q). Remove belt from idler.

Installing Drive Belt (GX85)

Before installing drive belt, study illustration below.


M74459

A - Flat Idler

B - Jacksheave

C - Flat Idler

D - Drive Sheave

E - Drive Belt


M47736

1. Turn belt inside out. Bring belt in from front of Riding Mower and place belt (A) on upper part of engine sheave (B) with "V" of belt in "V" of engine sheave.

2. Place belt on drive sheave (C).

3. Place belt under belt guide (D) on idler (E).

IMPORTANT: Avoid damage! Belt guides must not rub on engine sheave.



M47736

4. Tighten nut (F).

5. Place belt around idler (G).

6. Install belt guide (H) and nut (I).

7. Tighten nut (I).


M47734

8. Check belt to MAKE SURE it is installed on all idlers.

9. Install belt guides (J) with carriage bolt (K) and nuts (L).

10. Tighten nuts (L).

11. Unlock park brake.

Removing Primary Drive Belt (SX85)


M74354

A - Primary Belt

B - Engine Sheave

C - Variator

D - Primary Idler (Flat)

E - V-Idler

F - Nut

G - Belt Guide

c CAUTION: Avoid injury! Wear goggles when removing spring.

Before removing primary drive belt, study illustrations above.


M40389

1. Remove secondary spring (A) from frame with screwdriver.


M40561

2. Loosen nut (B) and move rear belt guide (C) away from engine sheave.

3. Remove nut (D) and front belt guide (E).

4. Remove mower belt (F) from engine sheave.


M61430

5. Move variator belt guide (G) from primary belt by loosening nut (H).


M74354

I - Primary Belt

J - Variator

K - Nut

L - Primary Idler (Flat)

M - V-Idler

N - Belt Guide

O - Engine Sheave

6. Remove primary belt (I) from lower sheave of variator (J).

7. Loosen nut (K) and move belt guide (N) away from V-idler (M).

8. Remove belt from primary idler (L) and V-idler.

9. Remove primary belt from engine sheave (O).

Installing Primary Drive Belt (SX85)



A - Primary Belt

B - Engine Sheave

C - Variator

D - Primary Idler (Flat)

E - V-Idler

F - Nut

G - Belt Guide


M74507

Before installing primary drive belt, study illustration above.

1. Install primary belt (A) on engine sheave (B) first and then variator (C).


M74508

2. Put primary idler (D) against outside (WIDE) belt surface.

3. Install belt on V-idler (E).

4. Move belt guide (F) into position and tighten nut (G)

IMPORTANT: Avoid damage! Belt guides MUST NOT rub on sheaves. (See Checking and Adjusting Drive Belt Guides (SX85) in this section.)



M61430

5. Put variator belt guide (H) as close to belt as possible.

6. Tighten nut (I).

IMPORTANT: Avoid damage! Belt guides MUST NOT rub on engine sheave. (See Checking and Adjusting Drive Belt Guides (SX85) in this section.)



M40561

7. Install mower belt (J) on lower engine sheave.


M40561

8. Adjust rear belt guide (K) until there is approximately 1.6-3.2 mm (1/16-1/8-in.) clearance to upper part of engine sheave.

9. Tighten nut (L).

10. Install front belt guide (M). Make sure there is approximately 1.6-3.2 mm (1/16-1/8-in.) clearance to upper part of engine sheave.

11. Tighten nut (N).

c CAUTION: Avoid injury! Wear goggles when installing spring.


M40389

12. Install secondary spring (O).

13. Put shift lever in N (NEUTRAL) position.

14. Release park brake.

Removing Secondary Drive Belt (SX85)


M74355

A - Flat Idler

B - Variator

C - Secondary Belt

D - Transaxle Sheave

E - Secondary Spring

c CAUTION: Avoid injury! Wear goggles when removing spring.

Before removing secondary drive belt, study illustration on previous page.


M40389

1. Remove secondary spring (A) with large screwdriver.

IMPORTANT: Avoid damage! Do not remove nuts.


2. Raise rear of riding mower to approximately 13 mm (1/2-in.) off cement or wood blocks. Use wood blocks at rear hitch area.


M40395

3. Loosen nuts (B). Transaxle should drop slightly.


M74561

4. Loosen nut (C) on variator belt guide (D). Move belt guide away from belt.

5. Remove primary belt (E) from lower sheave of variator.


M74356

6. Remove secondary belt (F) from top sheave of variator.

7. Pull belt off rear of transaxle sheave (G) and out left rear corner of riding mower.

Installing Secondary Drive Belt (SX85)


M74355

A - Flat Idler

B - Variator

C - Secondary Belt

D - Transaxle Sheave

E - Secondary Spring


M61431

Before installing secondary drive belt, study illustration on previous page.

1. Install secondary drive belt (A) on top of variator.

IMPORTANT: Avoid damage! Belt guides must not rub on sheaves. (See Checking and Adjusting Drive Belt Guides (SX85) in this section.)


2. Tab (B) of variator belt guide (C) should be contacting variator bracket (D). Guide should be parallel to side and top of belt, but not touching belt. Fasten with nut (E).

NOTE: Belt MUST BE tight when adjusting guide.


3. Tighten nut.


M74357

4. Install secondary belt (F) on transaxle sheave (G).

5. Install secondary belt on idler (H). Idler must engage outside (WIDE) belt surface.

c CAUTION: Avoid injury! Wear goggles when installing spring.


M40389

6. Install secondary spring (I).


M40395

7. Tighten nuts (J) on transaxle.

Checking and Adjusting Drive Belt Guides (SX85)

1. STOP engine.

2. Park riding mower on a level surface.

3. DO NOT engage park brake.


M62880

A - Nut

B - Front Belt Guide

C - Jacksheave

D - Nut

E - Rear Belt Guide

F - Tab

G - Belt GuIde (Variator)

H - Variator Bracket

4. Using a hoist or safe lifting device, lift rear wheels off surface.


62880

5. Loosen nut (A) under axle to adjust front belt guide (B).

6. Do not push on jacksheave (C) when moving guide to primary drive belt. Make sure there is 1.6-3.2 mm (1/16-1/8-in.) clearance between top of front guide and jacksheave.

7. Tighten retaining nut and check adjustment.


M62880

8. Loosen rear belt guide retaining nut (D).

9. Slide rear belt guide (E) rearward to end of slot.

10. Adjust rear belt guide to within 1.6-3.2 mm (1/16-1/8-in.) of the traction drive sheave (upper) portion of the jacksheave.


M62880

11. Tighten retaining nut and check adjustment.

12. Tab (F) of variator belt guide (G) should be contacting variator bracket (H). Guide should be parallel to side and top of belt, but not touching belt.

NOTE: Variator belt MUST BE tight when adjusting.

13. To attain proper adjustment, it may be necessary to bend guide.

14. To verify adjustments, operate riding mower after adjusting guides.