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BrentOntario

Posted 11/2/2006 00:40 (#57325)
Subject: NH 411 Discbine - 540 to 1000 RPM conversion

First off, the 411 was originally available in both 540 RPM and 1000 RPM PTO versions. In either case, the long drive shaft under the tounge turns at 1000. In the 540 version, the gearbox does the conversion, in the 1000 there is just a short jackshaft and housing in its place, which connects the PTO shaft and the driveshaft.

Looking to the rear, a 1000 RPM installation looks like the first picture below.

Of course, the cheapest way to do this is to find a 1000RPM 411 in a salvage yard, and get the compete jackshaft assembly and PTO shaft, too. If not, you will need from your NH dealer all of the parts below and shown on the exploded diagram, and also a different yoke on the PTO shaft to fit the 1000 RPM tractor shaft and maybe a different yoke on the other end to fit the splines on the new jackshaft. Check at your local heavy truck parts supplier.

Key # Part # Qty. Desc

1 59628 1 Oil seal, front

2 86516467 2 Tapered bearing cup

3 86516468 2 Tapered bearing cone

4 846626 1 Jackshaft

5 768776 1 Bearing housing (also need a ¼"-28 x 90° lube fitting, and mounted with 4 hex bolts & flat washers/lock washers, size M16-2 x 40mm)

6 634036 1 Oil seal, rear

7 693046, 693047, 693048 Shims, use as needed, in thicknesses 0.005", 0.007", 0.020"

8 692537 1 Bearing housing cap (mounted with 3 hex bolts, size M8-1.25 x 30mm, each with a 5/16" lockwasher).

Assemble the components as per the sectional diagram. Press the bearing cones (the halves with the rollers) on the jackshaft. Tap the bearing cup inside the front of the housing. Insert the shaft, then the rear bearing cup. Assemble bearing housing cap with the appropriate shims to achieve a very slight drag in turning without parts play and without seals installed. When attained, remove shaft to drive the front seal into the bearing housing and the rear seal in the housing cap. Reassemble with shaft.

Remove 5 bolts connecting long driveshaft flange yoke to slip clutch, and release shaft. Remove center bolt (the one wih the grease fitting), washers, and shims, and pull slip clutch off gearbox output shaft (look out! heavy!!). Depress both buttons on overrunning clutch (like detaching a PTO shaft from tractor), and pull off shaft.

Remove PTO shaft from gearbox. Remove gearbox by undoing 8 bolts, and may have to take off the rubber shield, too.

Now mount the new jackshaft assembly, only uses four bolts in the bottom set of slots. Install overrunning clutch on the rear of the shaft by depressing both buttons. slide on the slip clutch on the shaft, but you must hold on to the loose dogs on the overrunning clutch to make them point in the direction of rotation (clockwise when seen from the rear), while the slip clutch assembly is slid over it.

Replace bolt and washers to secure clutch to shaft. Bolt flange yoke back on.

Mount new yoke for the tractor end. Not sure if the existing PTO shaft will fit the new jackshaft - I'll leave it up to you to sort this out.

Edited by BrentOntario 11/2/2006 19:15