Progressive Turf Equipment SDR 90 - Manual (Page 9)

9
MAINTENANCE SAFETY :
 Never work on mower without safety locks in place, if decks are in raised
position.
 Keep tractor and mower in good operating condition and all safety devices in
place.
 Frequently check blade mounting bolts for tightness.
 Periodically check to ensure all bolts are tight and that all nuts, screws and cotter
pins are properly installed to ensure that the mower is in a safe condition.
PROPER TORQUE FOR FASTENERS :
The chart lists the correct tightening torque for fasteners on Progressive Turf
Equipment mowers. When bolts are to be tightened or replaced, refer to this chart to
determine the proper torque except when specific torque values are assigned in the
manual. Only SAE grade 5 fasteners are to be used in the assembly of this machine,
or as otherwise specified in this manual.
Bolt Head Markings
SAE Grade 2 SAE Grade 5 SAE Grade 8
(No Dashes) (3 Dashes) (6 Dashes)
Recommended Torque in Foot Pounds (Newton-Meters)
Bolt Diameter (in.) SAE Grade 5
5/16 21 (28)
3/8 38 (52)
7/16 55 (75)
½ 85 (115)
9/16 125 (170)
5/8 175 (240)
¾ 300 (410)
7/8 450 (610)
1 680 (925)
1” L. H. Spi ndl e Nut
60 (82)