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MAINTENANCE
The actual speed at which the harmonic will occur will vary with each mower and each installation. To avoid
this harmonic vibration when operating the mower, it may be necessary to adjust the engine speed of the
tractor up or down.
Some units have a harmonic which occurs below the nominal operating speed. On these units, it will be noticed
that there is always a little vibration at a particular RPM as the mower is being sped up to operating speed. This
occurs as the shaft passes through its normal harmonic vibration point. As long as the mower is opened at the
proper speed, then harmonic vibration will not be an issue.
Proper Torque For Fasteners
The chart lists the correct tightening torque for fasteners. When bolts are to be tightened or replaced, refer to
this chart to determine the grade of bolts and the proper torque except when specific torque values are
assigned in manual text.
RECOMMENDED TORQUE IN FOOT POUNDS UNLESS OTHERWISE STATED IN THE MANUAL*
NOTE: These values apply to fasteners as received from supplier, dry or when lubricated with normal engine
oil. They do not apply if special graphited or molydisulphide greases or other extreme pressure lubricants are
used. This applies to both UNF fine and UNC coarse threads.
HYDRO 88 & 96 03/09
Maintenance Section 5-11
©2009 Alamo Group Inc.
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