mEl,
Thanx for the reply and comments about the RPS C4 clutch actuation acting, somewhat, like a trans brake.It was a really nice, 40 degree, fall day here in SE Michigan so I decided to fire-up the 2870 and chisel plowed some of our Soybean ground. Because of our discussion about the C4 I paid close attention to the function of the RPS34. The RPS oil & filters were replace just last year when this Ol' girl was brought into our operation and it runs and shifts quite nice, especially in warmer weather. Much more HP and traction than our 2470. The following are my observations: > After a 10 min. warm-up, there was a little 'grinding' while shifting the 4-speed into 4th gear. > While driving to the field, Power Shifting the RPS up thru the gears at about 1500 RPM, the shifts were harsh and solid. RPS oil still kinda cold.
> 10 mins. later, arrived at field & downshifted to 2nd gear, less grinding noted than earlier when colder. Under draft-load of plow the up-shifts & down-shifts of the RPS were solid but not nearly as harsh as unloaded. > Plowed for about 3 hours, everything normal... love that HP! and 4-wheel steer. Then came home for lunch and noted no more grinding from the gearbox when she was fully warmed up. So, I suspect any "oil drag" within the C3 is not enough to act as a trans-brake, at least when the tranny is cold. But that seems intuitively backwards to me as any oil-drag should be greater with cold oil in the 4-speed as well as the RPS ?? After further thought about the logic of C4 application when the inching pedal is depressed... could it be related to the (normal) loss of RPS lube-oil pressure when the inching pedal is depressed? Perhaps locking the planetary drum minimizes friction (motion) within the PRS ?? Again, thanx in advance, for your comments
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