Fan Shaft Overhaul - Bearing Replacement
(SM, Para 155) Disassembly, See Figure 3 or PC304, page 12. 1. With fan shaft in vertical position and using a bar or press; force fan and drive discs into front bearing housing, and remove the two split cone locks (63) and keeper (62) from front of shaft. From front of tube, withdraw; Drive discs, Friction washers, and Fan and front bearing parts. 1-Alternate. With fan shaft in vertical position (fan up), jam fan shaft S/A down onto a wooden block, forcing fan down into front bearing. [No! The fan blades won't fall off!]. Remove the two split cone locks (63), and the fan (61). 2. From rear of tube, remove shaft (39) with gear (20), and rear assembly (41). 3. Repack front bearing (52) with high melting point lubricant and renew oil seals (47 and 55) (packing) when reassembling. Figure 3. Fan Shaft Assembly -- Illustration Only New Parts - - - a. JD7151, 7152 & 7153R (17,19, &18) Rear fan bearing, 3 parts b. JD7655, 7656, & 7657R (51,53, & 52) Front fan bearing, 3 parts b. JD7655, 7656, & 7657R (51,53, & 52) Front fan bearing, 3 parts c. B297R (55) Packing. Oil seal for front bearing, front side d. A393R (47) Packing. Oil seal for front bearing, rear side e. B298R (56) Retainer for B297R f. B293R (49) Packing. Oil seal for rear bearing, front side. Order of things -- Reference reassembly: 1. From front end of shaft (front bearing housing), we have B298 retainer 56), B297 felt washer or packing (55), 24H847 flat washer (54), JD7656 cone (53), JD 7657 roller bearing (52), JD7655 bearing cup (51), B295 spring (50), A286 retainer (hat-shaped) (48), A393 oil seal or packing (47), and 24H239 flat washer (the one with the smaller hole in its center - 46). 2. From the rear end of the shaft, we have a H392R snap ring (14), AH701R gear & pinion(20) w/H410R key (38), JD7152R cone (19), and JD7153R roller bearing (18) -- the roller bearing deepest onto the shaft. During reassembly, drive or press JD7152R cone down only as far as is needed to (also) bring on gear and install the snap ring. 3. For the H412R 41) rear bearing housing, we have the JD 7151R bearing cup (17) into one side, and the B293R (49) packing in the other. ++++
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