VALVE GP-FLOW DIVIDER 8U2075 - Caterpillar

Idler shaft bearing failure can cause seizure of the idler shaft in the idler and damage the major bogie idler shaft bores. Inserts are now available from parts service for repair.Two different roller frames are currently in production. This instruction gives the procedure for repair of the full skirted type (extended roller frame) used on the D10 and earlier D9L machines and also, the cut-off type used on the D8L.The following repair procedure is given as a guide for use with line boring equipment when these inserts are installed.Put the machine on a flat, level surface; make separation of the track and remove the idler (see the Service Manual). (1) Check to see if the bolt holes have threads all the way to the bottom. If the bolt holes have a counterbore, a bottom tap is not necessary. (All D9L machines have a counterbore in the bolt holes.) If it is necessary to make threads to the bottom of the hole, use a bottom tap with a maximum of 1 1/2threads of lead (taper) to cut the threads to the full depth of the bolt hole.
Make sure to check the thread size on each major bogie before the hole is bottom tapped. Some D8L machines have fine threads in the holes in one major bogie and coarse threads in the others. Tap sizes are: D8L - 1.0"-14 NS or 1.0"-8 NC and 1.125"-12 NF for the D10.
(2) On full skirted roller frames, cut a 75Ø to 100Ø (3.0"Ø to 4.0"Ø) hole (A) in the roller frame in line with the major bogie idler bores (both sides). This will give clearance for use of the boring bar. With a cutting torch or similar tool, remove retaining shoulder (1) and sheared (cut) off roll pin (2) from the bore of the original caps. Keep the caps for later use. (3) Install new caps (3) on the major bogie with .5 (.020") shims (4) as spacers. Use of new caps (3) with a smooth bore will give more accuracy for location of the boring bar. It may be necessary to trim (cut) the retaining shoulders from the new caps to give clearance for the boring bar. Finger tighten the bolts just enough to hold the boring bar in position when installed. (4) Make centering rings (5) (for the boring bar) to the dimensions given. Make diameter (B) so that the ring moves freely on the boring bar. Install boring bar (6) with rings (5) to keep the boring bar in the center of the idler shaft bores. Make sure rings (5) are against the bores in the idler shaft caps. (5) Put the front and rear bearing assemblies (7) for the boring bar in position as shown. Put a cover over the boring bar for protection during welding. Both types of roller frames are shown above; bearing assembly position (C) is the front location and bearing assembly position (D) is the rear location on the extended roller frames.