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This two speed pulley can increase the effective operation of various attachments. It is designed to provide a direct drive which reduces ground speed but not PTO speed.  When engaged, speeds will be reduced to one third. THIS UNIT DOES NOT ALTER THE ATTACHMENT SPEED.  The operator can change the tractor ground speeds without leaving the seat. This is done by the shift lever on the right side of the tractor.

This two speed pulley is particularly useful with the front mounted Snow Blower and Snow Plow dozer blade. It is also useful with the rear mounted rotary tiller and other tillage tools.

NOTE: This two speed pulley can also be installed on the 9 Hp. B-10 and B-1 riding tractors. However, it is necessary to cut 1" off of the pulley shaft. This can be conveniently done with a suitable instrument (saw) if the seat and transmission pulley is removed. Remove all burrs and metal shaving prior to installing this two speed pulley.


First 1.6 MPH .5 MPH
Second 3.7  1.3
Third 6.1 2.2
Reverse 3.1 1.1


Engagement of the reduced speeds is done by the operator pushing the knob to the left. Push to the right for disengaging.

IMPORTANT: It is important the tractor transmission is stopped for changing ranges with the low speed pulley. /Make sure the idler pulley is completely disengaged before the brake is applied. (This adjustment will be found in the tractor owners and operators manual.) This will eliminate the clashing of gears and prolong their life.


Lubrication is applied at the factory. Prior to installation, remove set collar and pulley from gear assembly to determine if lubrication has been applied. After 100 hours of operation, remove capscrew from cover, insert the grease fitting which is shipped loose, and apply several shots of multi -purpose lithium- based type grease. Remove fitting and reinstall capscrew. IMPORTANT! DO NOT LEAVE GREASE FITTING IN THE COVER ESPECIALLY WHEN USING TIRE CHAINS. SUBSEQUENT DAMAGE CAN RESULT. Apply a little grease on shift pivots before slipping them over shift ring.


The two speed pulley is shipped in one carton. The grease (zerk) fitting is shipped loose in this package. All necessary hardware is included.


ALLIS-CHALMERS MANUFACTURING COMPANY (the Company) warrants its new machinery covered by this order or contract (excluding tires and B-Series engines and engine accessories which are warranted by the respective manufacturers only) to be free of defects in workmanship and material at the time of shipment from the Company's factory.

This warranty is the only warranty upon which the Company's new machinery is sold. NO OTHER WARRANTY SHALL BE IMPLIED AND ALL STATUTORY WARRANTIES SHALL BE DEEMED WAIVED. No warranty of any kind, statutory, implied, or otherwise, is made with respect to second-hand machinery or with respect to new machinery which, after shipment from the Company's factory, has been altered, repaired or treated in any manner whatsoever.

The Company will repair or replace f.o.b, its factory any part in its new machinery which under normal use fails within twelve months {except six months instead of twelve months in the case of products of the Springfield and Deerfield Works of the Company and engines sold as power units) from date of delivery of such machinery to the first user, provided that the Company is promptly notified thereof and that the part is returned to the Company or to an authorized dearer properly identified, charges prepaid, and is found to the satisfaction of the Company to have been defective in workmanship or material at the time of shipment of the machinery from the factory as aforesaid.

The Company's liability whether in contract or in tort arising out of warranties, representations, instructions, or defects from any cause shall be limited exclusively to repairing or replacing under the conditions as aforesaid.

No representative of the Company has authority to change this warranty and no attempt to repair or promise to repair or improve the machinery by any representative of the Company shall change or extend this warranty.

[Source:  Allis-Chalmers Operating Instructions for High-Low Pulley No. 2025063, Form TM-7013]




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