11. Installation of Chain Guards: At this time, if you have chain guards, you may
layout and drill the mounting holes per drawing. Take four 5/16-18 x 3/4 Cap Screws
and insert into chain guard and then into holes just drilled. Inside 1A Wall, secure
with 5/16 WI Washer and 5/16-18 Locknut. Do this for both sides.
12. Inside Body, slide ten 7/8 WI Washers over each protruding end of #20 Sprocket
and Shaft. Insert 3/16 sq. x 3/4 Key into each Keyway and slide one #29 Pulley over
each Shaft end engaging the 3/16 sq. Key completely in hub of #29 Pulley. Tighten
both set screws in each #29 Pulley. Slide five more 7/8 WI Washers over each end of
#20 Shafts followed by a 3/16 sq. x 1 Key and second #29 Pulley on each side - tighten
all set screws. (On models MD1612 and MD1600: slide five (5) more 7/8 WI Washers over
each end of #20 Shafts followed by a 3/16 sq. x 1 Key and a third #29 Pulley on each
side - tighten all set screws.) Slip on 7/8 WI Washers necessary to fill out each end
of #20 Shaft up to each 1/8" hole - secure with 1/8 x 1-1/2 Cotter Pin. NOTE: Hubs
of #29 Pulleys above should all point toward center of Tractor - see drawings.
13. Insert 3/8-16 x 1-3/4 Cap Screw into 3/8 Star Washer and 3/8 WI Washer; then from
inside, slip Cap Screw into 3/8" slot in #1H Segment. On the other side of #1H Segment
(side closest Left Body Wall) , you may slip on seven 3/8 WI Washers followed by #27
Idler Pulley. (At this time, loop the #33 Main Drive Belt over #27 Idler Pulley.)
Secure this Pulley Assembly by inserting protruding end of Cap Screw into nut welded to
#23 Handle. Check your assembly against drawing; make sure "handle" portion of #23
Handle is pointing toward center of Tractor Body and that #33 Belt is held between the
groove of #27 Pulley and the 1/4" round rod welded to #23 Handle Assembly. Tighten
Cap Screw so it will still be able to slide freely in 3/8" slot in #1H.
14. Assemble the #30 and 31 Pulleys onto their respective #21 Upper and Lower Shafts.
NOTE:
A. On models MD1200 & MD1207, the #30 Pulleys are both of the "V" type; on models
MD1612 & MD1600, the upper #30 Pulley is "V" type while the lower #30 Pulley is the
"flat" type.
B. On models MD1200 & MD1207, two #31 Pulleys are on the Upper Shaft, two are on
the Lower Shaft; on models MD1612 & MD1600 four #31 Pulleys are on the Upper Shaft, two
are on the Lower Shaft.
C. Note that hub of #30 Pulleys point inward on both Upper and Lower #21 Power
Shafts; also the hubs of the #31 Pulleys point toward each other on the Lower Shaft, but
away from each other on the Upper Shaft.
15. Assemble #26 Self-aligning Bearings by placing a spherical bearing unit between two
stamped mounting halves - loosen all Bearing set screws with Allen Wrench provided.
Mount two of these assemblies in the 1-3/4" holes on inside of left #1AL Body Wall with
1/4-20 x 1/2 Carriage Bolts provided. Loosely apply 1/4-20 Locknuts to above Bolts
which should protrude out left side of Body. NOTE: Bearing's hubs (with set screws)
should be to the outside.
16. From inside Body, insert the "right" ends of #21 Upper and Lower Power Shafts a few
inches into their respective 1-3/4" dia. holes on right #1AR Body Wall. (NOTE: On
models MD1200 & MD1207, loop two #34 "V" Belts on both the Upper and Lower #21 Shafts;
on models MD1612 and MD1600, loop four #34 "V" Belts over Upper Shaft and two #34 Belts
over Lower Shaft.) Check that Lower #21 Power Shaft does not go through #33 Belt; and
that Upper #21 Power Shaft does go through #33 Belt. (NOTE: CHECK "BELT DIAGRAMS" FOR
PROPER BELT WRAPPING.)
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