Nelson Irrigation Corporation 848 Airport Rd. Walla Walla, WA 99362 USA Tel: 509.525.7660 Fax: 509.525.7907 [email protected] Web site: www.nelsonirrigation.com
HD LOWER BEARING MAINTENANCE
DISASSEMBLY
(HD LOWER UNIT)
STEP 5
Fully coat #7007 O-Ring
with #9673 Silicone Grease
& #9680 Graphite. Install
prepared O-Ring into #7877
Spacer and mount onto
assembly.
SEE SR75 PARTS LIST FOR PARTS INFORMATION
STEP 3
Remove the #6998 Seal. To
remove the two #6559 Bearings
use a hammer and three blocks
of wood. Lightly tap uniformly
around inner race of bearing until
removed. Bearings are removed
from opposite sides of the #8472
Housing.
STEP 4
Install #6999 O-Ring in #7003
Retainer and assemble retainer
on shaft. Using method described
in disassembly (Lower Unit)
instructions Step 2, secure bearing
shaft from rotating. Torque Retainer
to 95-110 ft. lbs. Apply a light
coating of #9673 Silicone Grease
to O.D. of Retainer. Assemble
#6998 Lip Seal. Orient with lip
side out. Metric Torque = 129-149
NM or 13-15 MKG.
STEP 2
The #10083 Retainer Assembly
is removed by using spanner
wrench. To hold the #7031 Shaft
Assembly from rotating insert
two 5/16-18 bolts (#6635) into
shaft top. Clamp bolt heads
into a vise securely. Remove
retainer and #8472 Housing
from bearing shaft.
STEP 3
Assemble #6566 Gasket.
Press on #8472 Housing.
Fully pack housing with #6143
Lubricant. Assemble #6559
Bearing into housing.
STEP 2
Place #6997 Lip Seal into #6858
cover as shown with Nelson name
toward ball bearing. Pack #6559
Bearing with #6143 lubricant
or equivalent. (See “Notes on
Lubrication” on the front cover.)
Press bearing into #6858 Cover.
Slide cover assembly onto bearing
shaft. CAUTION: Do not get grease
on brake surfaces. To clean plastic
brake, use soap and water (solvents
may damage plastic). Clean #6858
cover with acetone.
10/13
#10083
#6997
#6559
#6998
#10083
#7007
#7877
#10087 Spacer Assembly
REASSEMBLY
(HD LOWER UNIT)
STEP 1
Assemble #7009 Dust Seal onto
#7031 Shaft Assembly. Slide
#6996 Brake Ring onto shaft.
Locate the four studs of the brake
ring in the center holes between
the smaller threaded holes.
#7031
#7009
STEP 1
Remove three #7990 or #7991
bolts from flange. Separate
#8472 housing from #10087
Spacer Assembly. Remove
#7007 O-Ring from #10087
Spacer Assembly.
#8472
#7991
or 7990
#10087
#7007
STEP 4
Remove #6585 Cover from
shaft. Remove #6997 Seal from
cover. Remove #6996 Brake
Ring and #7009 Dust Seal
from shaft.
Inspect all parts for wear and
replace as required.
#6858
#6997
#6996
(Bronze Model #9492)
STEP 6
Assemble #8967 O-Ring into
the Flange Adapter. Mount
Flange Adapter using required
Bolts. Torque Bolts to 130-150
inch pounds.
O-Ring
#8967
4
#6996
or #9492
