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MAINTENANCE
FN20/FN14 NITRO 02/10 Maintenance Section 5-20
© 2010 Alamo Group Inc.
MAINTENANCE
BLADE CARRIER INSTALLATION
Clean the taper and keyway on both the blade carrier and output shaft. Position carrier on the gear box output
shaft and install flat washer and 1" hex nut. Tighten the nut holding the blade carrier to minimum 600 ft.
pounds. Strike the carrier on the hub several times with a heavy hammer to seat the hub. Use a suitable spacer
over the nut to prevent damage to the nut and threads. Retighten the nut to 600 ft. pounds. Install and spread
cotter pin.
Operating the mower with a loose blade pan or holder can damage the taper connection on
the gearbox output shaft. To ensure proper seating between the blade holder and output
shaft check and tighten the retaining nut after the first day of operation. Recheck the blade
carrier attachment each morning before operating. Grasp the carrier firmly with both hands
and try to push and pull the carrier with one hand while pulling and pushing with the other
hand to try to rock or oscillate the blade carrier. If the carrier is loose retighten the retaining
nut before operating the mower.
NOTE: After a few hours of operation always recheck blade carrier retaining nut torque.
Avoid personal injury. Do not work under cutter without support blocks to keep frame from
falling.
TORQUE LIMITER
Avoid overheating of the Torque Limiter by too long or too frequent slipping since this can damage the friction
plates and limiter parts. When checking the Torque Limiter for overheating, DO NOT touch with hand. It could
be extremely hot and cause severe burn.
If an adjustment is required, this may be done in the field by following the procedure outlined below. Following
these instructions will give maximum rated torque and long life.
(a) With the three Capscrews (#8) backed out until the points are below the surface of the circular Adjusting
Nut (#7), run Adjusting Nut up finger-tight.
(b) Alternately tighten the hardened, cup point Capscrews (#8) no more than one-half turn at a time until the
Capscrew heads "Bottom Out". Do not over tighten the Capscrews nor completely flatten the Spring Washers
(#5).
If the Hub is removed from the Shaft for any reason, the Shaft and Hub should be coated with a heavy grease
before reassembly to prevent Hub from freezing to Shaft.
SEASONAL TORQUE LIMITER MAINTENANCE
It is important that the Torque Limiter slips when an obstacle or load heavier than the setting is encountered.
Before using the Torque Limiter each season, use the following procedure to make sure it will slip and give the
overload protection required.
Loosen Bolts (#8) until gap between adjusting nut (#7) and guide ring is approximately 1/16".
Attach machine to tractor, set engine at approximately half throttle and quickly engage PTO. This procedure
will break clutch facings loose and allow the proper torque to be maintained.