Briggs & Stratton FW25 series Setup Instructions page 5

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3. Check that a flat washer (B) is installed between each blade
and the head of it's mounting bolt (C).
4. Wedge a wooden block (D) between the mower blade and
the mower deck housing to keep the mower blade from
turning. Torque each mower blade mounting bolt to 120 ft.
lbs. (163 Nm).
Check and Level the Mower Deck
The levelness of the mower deck is determined by how the
cutting height was set. See Cutting Height Adjustment for the
cutting height adjustment procedure.
Check the Mower Deck Drive Belt
NOTICE To avoid damaging belts, do not pry belts over
pulleys.
1. Park the unit on a flat level surface such as a concrete floor.
Disengage the PTO, engage the parking brake, turn the
ignition switch to OFF and remove the key.
2. Lower the mower deck to its lowest cutting position and
remove the mower deck guards.
3.
• 36" Mower Decks: Make sure that the V-side of the
mower deck drive belt (B, Figure 6) runs in the pulley
grooves of the spindle pulleys (D), and the pulley
grooves of the PTO clutch pulley and that the back side
of the belt contacts the rear stationary pulley (C) and
the adjustable idler pulley (E).
36" Mower Decks
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• 48" & 52" Mower Decks: Make sure that the V-side
of the mower deck drive belt (B, Figure 7 & Figure 8)
runs in the pulley grooves of the spindle pulleys (D),
and the pulley grooves of the PTO clutch pulley and
that the back side of the belt contacts the front
stationary pulley (E), rear stationary pulley (C) and the
adjustable idler pulley (F).
48" Mower Deck - S/N: All & 52" Mower Decks - S/N:
2017243271 & Above
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WARNING
Use extreme caution when rotating the idler arm with the
breaker bar due to the increased tension in the spring as the
idler arm is being rotated. Injury may result if the breaker bar
is prematurely released while the spring is under tension.
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