Poulan Pro 404378, Operator'S Manual

21

SERVICE AND ADJUSTMENTS

NOTE:

  Each full turn of the adjustment nut will change 

mower height about 1/8".
•         Recheck measurements, adjust if necessary until front 

tip of blade is 1/8" to 1/2" lower than the rear tip.

•         Hold adjustment nut in position with wrench and tighten 

jam nut securely against adjustment nut.

TO REPLACE MOWER DRIVE BELT    
(See Fig. 26)

MOWER DRIVE BELT REMOVAL
•     Park tractor on a level surface. En 

gage parking 

brake.

•      Lower attachment lift lever to its lowest position.
•     Remove any dirt or grass clippings which may have 

accumulated around mandrels and entire upper deck 
surface.

•      Remove belt from electric clutch pulley (M), both man-

drel pulleys (R) and all idler pulleys (S).

MOWER DRIVE BELT INSTALLATION 
•      Install belt around all mandrel pulleys (R) and around 

idler pulleys (S) as shown.

•      Install belt onto electric clutch pulley (M).

IMPORTANT: 

 Check belt for proper routing in all mower 

pulley grooves.
•      Raise attachment lift lever to highest position.

FIG. 26

R

R

S

M

TO REPLACE MOTION DRIVE BELT    
(See Fig. 27)

Park the tractor on level surface.  En gage parking brake.  
For as sis tance, there is a belt installation guide decal on 
bottom side of left footrest.

BELT REMOVAL -
•      Remove mower (See “TO RE MOVE MOWER” in this 

section of manual).

NOTE:

 Observe entire motion drive belt and position of all 

belt guides and keepers.
•     Remove belt from stationary idler (A) and clutching 

idler (B).

•      Remove belt from centerspan idler (C).
•     Pull belt slack toward rear of trac tor.  Remove belt 

up wards from trans axle input pulley (D).

•      Remove belt downward from engine pulley (E).
•      Slide belt toward rear of tractor, off the steering plate 

(F) and remove from tractor.

BELT INSTALLATION -
•         Install new belt from tractor rear to front, over the steer-

ing plate (F) and above clutch brake pedal shaft (G).

•      Pull belt toward front of tractor and roll belt onto engine 

pulley (E).

•         Pull belt toward rear of tractor. Carefully work belt down 

around transaxle input pulley (D). Be sure belt is inside 
the belt keeper.

•      Install belt on centerspan idler (C).
•     Install belt through stationary idler (A) and clutch ing 

idler (B).

•     Make sure belt is in all pulley grooves and in side all 

belt guides and keep ers.

•      Install mower (See “TO IN STALL MOWER” in this sec-

 tion of manual).

FIG. 27

A

B

C

D

E

F

G

TO CHECK BRAKE 

If tractor requires more than fi ve (5) feet to stop at highest 
speed in high est gear on a level, dry concrete or paved 
surface, then brake must be serviced.

You may also check brake by:
•      Park tractor on a level, dry concrete or paved surface, 

depress brake pedal all the way down and engage 
parking brake.

•      Place gear shift lever in neutral (N) position.

The rear wheels must lock and skid when you try to manu-
ally push the tractor forward. If the rear wheels rotate, then 
the brake needs to be serviced. Contact a  qualifi ed service 
center.