John Deere

OMM131756

Issue B9

Commercial Walk-Behind Mowers

GS30, GS45 and GS75

Serial No. (020001 - )

Introduction

Safety Signs

Controls

Operating

Replacement Parts

Service Machine Safely

Service Interval Chart

Service Engine

Service Engine

Service Transmission

Replacing Transmission Drive Belt

Adjusting Transmission Drive Belt Tension

Adjusting Transmission Shift Lever Neutral

Adjusting Transmission Reverse Lock Rod

Checking Gear Transmission

Service Steering & Brakes

Service Mower

Service Electrical

Service Miscellaneous

Troubleshooting

Storing Machine

Assembly

Specifications

Warranty

Service Literature

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Service Transmission


Replacing Transmission Drive Belt



1. Remove the clutch to mower deck drive belt (A). (See Replacing Clutch To Mower Deck Drive Belt (48/54-Inch Deck or Replacing Clutch To Mower Deck Drive Belt (36-Inch Deck in the Service - Mower Section)



2. Disconnect the electric PTO clutch connector (B).



3. Loosen nut (C).

4. Move idler (D) to remove old drive belt. Install new transmission drive belt.

5. Move idler (D) as required to tighten new drive belt and tighten nut (B).

6. Check drive belt tension and adjust if necessary. (See Adjusting Transmission Drive Belt Tension in this section)

7. Connect the electric clutch connector (B).

8. Install the clutch to mower deck drive belt (A). (See Replacing Clutch To Mower Deck Drive Belt (48/54-Inch Deck or Replacing Clutch To Mower Deck Drive Belt (36-Inch Deck in the Service - Mower Section)

Adjusting Transmission Drive Belt Tension

IMPORTANT: Avoid damage! Due to belt stretching, the tension on the transmission drive belt should be adjusted after the first 25 hours of use.




Check drive belt deflection. Belt should deflect a little (A) with moderate thumb pressure.

If necessary, adjust tension:

ˇ Loosen nut (B).

ˇ Move idler (C) as required to loosen or tighten drive belt.

ˇ Tighten nut (B).

ˇ Check belt deflection again.

Adjusting Transmission Shift Lever Neutral



The transmission shift lever "N" neutral position is adjustable. Adjust shift lever as required.

NOTE: Vehicle should roll easily when the transmission is in neutral and brakes are released.

Adjust shift lever:

ˇ Loosen lock nut (A).

ˇ Loosen lock nut (B) just enough to move the shift lever (C).

ˇ Align reverse lock rod (D) with "N" neutral on label and tighten lock nut (B).

ˇ Tighten lock nut (A).

ˇ Move shift lever through-out all forward and reverse gears.

ˇ The reverse lock rod (D) should align with numbers on label.

ˇ Repeat adjustment procedure until everything is in alignment.

Adjusting Transmission Reverse Lock Rod



The reverse lock rod should be fully seated in the speed indicator plate (A) neutral "N" notch. Adjust reverse lock as required.

Adjust reverse lock:

ˇ Loosen lock nut (B).

ˇ Adjust reverse lock rod (D) location by tightening or loosening nut (C).

ˇ Tighten lock nut (B).

Checking Gear Transmission

The gear transmission in this unit is a sealed component. No maintenance is required on this transmission. If you suspect any transmission problems, please contact your John Deere Dealer.