Re: PT-425 PROS & cons??
con: Floppy Treadle
Problem:
Unlike the accelerator on a car, the hydraulic treadle on the newer PT-425 is floppy, requiring only about 1 pound of foot pressure to go to full on, forward or reverse! This light resistance is difficult to modulate, can produce foot cramping from continually keeping the foot from resting on the treadle, and can result in dangerous abrupt speed changes on rough ground!
Solution:
Increase treadle resistance to about 20 to 25 pounds without preload!! The pedals are easier to modulate even on uneven ground. The foot can now rest on the treadle without reaction until further pressure is applied to move the PT. The danger of inadvertently touching the treadle resulting in sudden unexpected PT movement is greatly reduced. The feel of the treadle under the foot is similar to that of an accelerator.
Parts:
2 Highland Triple Strength 18” Stretch Cords (WalMart)
2 1/4-20 x 2” Carriage Bolts
2 1/4-20 Nylon Insert Nuts
Tools:
Hacksaw
Drill Motor
1/4” Drill Bit
Center Punch
Ratchet
7/16” or 11mm Socket
Procedure:
1) Cut both hooks off both cords at the plastic block.
2) Drill a 1/4” hole in the center of each plastic block.
3) Make a loop in a cord by inserting a center punch through the holes in the plastic blocks.
4) Slip the loop (A) over the end of the treadle.
5) Align the loop vertically over point (C) on the treadle.
6) Raise the center punch until ALL slack is removed from the loop. (THERE MUST BE NO PRELOAD ON THE TREADLE!!)
7) Center punch for a hole at this location (B).
8) Drill a 1/4” hole at (B).
9) Insert a carriage bolt through both blocks and the hole at (B).
10) Install and tighten 1/4-20 nut.
11) Repeat steps 3 to 10 for the other side of the treadle.
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