ryan LAWNAIRE 28 544874F, Operator'S Manual

20

Lawnaire

28

TRANSMISSION SERVICE

OUTPUT SHAFT

10. Remove both of the gears and key from the shaft 

A

.

11. Check the shaft 

A

 for wear and replace if 

necessary.  If replacing shaft, install existing snap 
ring

B

 on new shaft. Check for, and remove any 

burrs on key ways in the shaft.

12. Replace the press-in bushings in the double gear 

E

(be sure the oil holes in the bushings align 

properly), or, replace the gear if necessary.

13. Reinstall the key 

C

and single gear 

D

on the 

output shaft 

A

.  The end of the gear with the 

higher step should face the snap ring 

B

.

14. Install the double gear on the shaft with the small 

end facing the single gear. 

15. Install the spacer 

F

 on the shaft next to the 

double gear.  Be sure the spacer at the end of 
the output shaft stays in position while installing 
gears in case halves.

16. Install both shafts with gears into one of the case 

halves.  Rotate one shaft to make sure the other 
turns and keys are in proper location.

17. Apply Loctite 515, or equivalent, to the mating 

edges of the case halves.  Be sure the case 
alignment spacers are in place in the upper and 
lower middle holes and put the two halves of the 
case together.

18. Install the clutch bracket and hardware (with 

screw heads on the input shaft side).  Torque the 
hardware to 16 ft. lbs. (22 N·m).

19. Apply some 30W oil to the lips of the oil seals 

and install one on each side of the transmission.

20. Reinstall pulley and sprocket.

21. Position the transmission in its mounting location.  

Remove one of the filler plugs and fill the case to 
the bottom of the filler hole with 

80-90W gear lube.  Reinstall the filler plug.

22. Mount the transmission back on the unit and 

reconnect the drive belt adjustment screw and 
tension spring.

23. Align the belt pulley by loosening the set screw 

and moving the pulley on its shaft until it aligns 
with the drive belt.  Tighten the set screw.

24. Check the drive belt tension and adjust if 

necessary (See drive belt adjustment).

25. Reinstall the primary drive chain and chain 

adjustment screw.  Adjust screw to obtain 

1/8" - 1/4", (3 - 6mm) deflection in the chain at 
the center point of the chain's span between the 
two sprockets. 

NOTE:

Excessive roller chain tension will shorten 
bearing life. 

26. Reinstall shields before operating the unit.

SERVICE