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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

Summary of Contents for BIG BUN SR75

Page 1: ...ater resistant lubricant that is packed in the housing cavities and retained by seals If repair of the lower bearing is done it is recommended to use Nelson 6143 lubricant or a good grade of water resistant lubricant such as Lubriplate 130 AA SR75 DRIVE ARM ASSEMBLY COMPONENTS The SR75 is available in fixed trajectory angles of 18 21 24 43 10377 O Ring Non Standard 459 I D x 040 C S 10193 Spacer T...

Page 2: ...g guide Pull entire trip lever assembly from gun Inspect wear on the 8282 follower and 8193 pin STEP 4 Drive Arm Remove four 8311 screws Remove 10231 cap STEP 5 Using an 11 16 socket remove the 6603 nut from left side of arm 8193 Pin 8282 Follower Spring Guide 8323 201 8282 STEP 6 Holding the range tube pull drive arm from the right side until it is free from hub STEP 7 Inspect both left and right...

Page 3: ... Make sure the 10191 cam is correctly keyed into the slot on the drive arm shaft Notice the correct orientation of the finger on the cam for proper arm operation STEP 4 Continue the sequence of sliding onto the drive arm shaft the 10192 spacer and the 10189 spring Notice the hook end of the spring goes in first so the spring wire loops around the finger of the 10191 cam STEP 5 Thread on 6603 nut T...

Page 4: ...ve 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 a...

Page 5: ...ve the 10719 Nipple Bearing by holding the piece of steel with a wrench and slowly unthreading from the 10696 Adapter Assembly Nelson Irrigation Corporation 848 Airport Rd Walla Walla WA 99362 USA Tel 509 525 7660 Fax 509 525 7907 info nelsonirrigation com Web site www nelsonirrigation com STEP 1 Remove three 6010 screws Remove 10088 xxx Flange Assembly Connection STEP 9 Remove the 6997 Upper Seal...

Page 6: ...g specifications for which the products were designed and under normal use and service The manufacturer assumes no responsibility for installation removal or unauthorized repair of defective parts The manufacturer s liability under this warranty is limited solely to replacement or repair of defective parts and the manufacturer will not be liable for any crop or other consequential damages resultin...

Page 7: ...ibility for installation is limited solely to replacement or repair of defective parts and the manufacturer will not be liable for any crop or other consequential damages resulting from any defects or breach of warranty THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSES AND OF ALL OTHER OBLIG...

Page 8: ...8327 001 Spacer back into arm hub Holding onto counter weight remove drive arm and counterweight Be careful not to damage seals STEP 8 Holding counterweight in place on the left side of shift lever roll drive arm into position shown by pushing on the left arm bearing Work 8327 001 Spacer into seal on counterweight Be sure spacer is correctly positioned in counterweight to prevent cutting of the se...

Page 9: ...oating 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 12 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 17 Asse...

Page 10: ...1 Shaft Assembly HD100 1 7990 Screw 3125 18 x 4 25 Hex Hd Cap 3 7991 Screw 3125 18 x 4 Hex Skt Hd Cap 3 8472 Housing HD100 1 8967 O Ring 231 Special 1 10083 Retainer Assembly HD100 1 10086 Flange Assembly Nelson 1 10087 Spacer Assy Alum HD100 1 10087 003 Spacer Assy Brass HD100 1 10088 001 Flange Assembly 2 FNPT 1 10088 002 Flange Assembly 2 5 FNPT 1 10088 003 Flange Assembly 2 FBSP 1 10137 001 Fl...

Page 11: ...ent or repair of defective parts and the manufactures will not be liable for any crops or other consequential damages resulting from any defects or breach of warranty THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSES AND OF ALL OTHER OBLIGATIONS OR LIABILITIES OF MANUFACTURER No agent employ...

Page 12: ...amage seals STEP 8 Holding counterweight in place on the left side of shift lever roll drive arm into position shown by pushing on the left arm bearing Work 8327 001 Spacer into seal on counterweight Be sure spacer is correctly positioned in counterweight to prevent cutting of the seal lip Push shaft through the bearings and spacers and assemble 6603 Nut Torque to 25 ft lbs using two 11 16 sockets...

Page 13: ... in 8402 Retainer and assemble retainer on shaft Using method described in disassembly Lower Unit instruct ions Step 12 secure bearing shaft from rotating Torque on 10068 Retainer Assembly to 100 120 ft lbs Assemble 8373 Lip Seal Orient with lip side out STEP 12 The 10068 Retainer Assembly is removed by using a spanner wrench with unit still bolted into vise NOTE An extension handle on the spanner...

Page 14: ... Tel 509 525 7660 Fax 509 525 7907 E mail nelson nelsonirr com Web site www nelsonirrigation com LOWER BEARING ASSEMBLY PARTS LIST 2 14 SEE SR150 SRA150 PARTS LISTS FOR DETAILS ON OTHER PARTS NELSON EURO FLANGE Flange assembly includes 8475 001 8458 NELSON EURO FLG CONN ...

Page 15: ... to be free of defective materials and workmanship when used within the working specifications for which the product was designed and under normal use and service The manufacturer assumes no responsibility for installation is limited solely to replacement or repair of defective parts and the manufactures will not be liable for any crop or other consequential damages resulting from any defects or b...

Page 16: ...c of coverage Stops must be mounted such that the arrows point towards each other with the Trip Lever located between them If the Stops are set incorrectly on the wrong end of the arc the sprinkler will fail to reverse 4 The SR200 is factory set for normal rotation speed If a faster or slower speed is desired move the Arm Weight backward for faster operation or forward for slower operation 5 The S...

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