Systems / Deck
The main idler is the silver idler on the X factor deck and is designed to
maintain constant tension on the primary deck belt around the left and center spindles.
The idler ensures up to 50% belt wrap is maintained on the left spindle.
The main idler is mounted to an idler bracket, which has constant tension (non-adjustable) from
the tensioner spring. This is part of the AriensCo. Constant Belt Tension Deck System
(CBT Deck System).
The XFactor3 deck has one stand-alone pulley placed to the left of the center spindle.
This is to allow for more belt wrap around the center spindle as the belt routes
back to the PTO Clutch pulley. The pulley is also in place to allow for
added tension on the belt.
The majority of Gravely commercial decks are designed with a two-belt system to ensure
optimal performance. The belt on the left is a V-belt, also known as a cut-edge belt.
This is a more aggressive belt that will reduce slippage when engaging your PTO Clutch.
The secondary belt is often a cogged style belt, which will allow for more forgiveness
around a smaller pulley.
Tech Tip: Look at your belt. There should be a certain amount of glaze or shininess
after some wear, which is caused by running in the pulleys or a minimal amount of
slip. However, if your entire belt is glazed or shiny, that is when you will begin
to see differences in the RPMs and therefore excessive slip.
Gravely spindles are designed with forged aluminum to help withstand excessive heat. If you have
a customer that complains of poor quality of cut, especially with the Mohawk effect where you see
uncut grass between your spindles, then you should be assessing spindle speed. Or when you see belts
snapping with a clean cut, that could indicate a bad bearing on a spindle or multiple spindles
causing excessive drag (spindle speed loss).
Your deck and spindles are designed to run at full throttle when mowing. Therefore, when cutting the
spindle speeds should be at approximately 3500 RPMs. They will change from deck to deck because of
pulley size and blade size.
The best type of blade is dependent on the conditions and environment in which you are cutting in.
If you have problems with cut quality, four easy checks can be done even before deck troubleshooting:
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