NELSON 9822 Drive Arm and Counterweight Kit

Product Specifications

• Product Name: #9822 SERVICE KIT
• Part Number: PN03107
• Expiration Date: 3/20/2024

Product Usage Instructions:

Drive Arm Disassembly:
To disassemble the drive arm, follow these steps:

Step 1 – Remove Drive Arm:

1. Remove the retaining ring and end cap from each drive arm bearing hub.
2. Use two socket wrenches to remove the nut from the shaft.
3. Check the straightness of the shaft and replace if bent.
4. Insert a screwdriver blade between the drive arm bearing hub and counterweight bearing hub to remove the spacer and ball bearing.
5. Rotate the drive arm bearing hub up to remove the drive arm from the Big Gun.

Step 2 – Remove Seals and Bearings from Counterweight:

1. Remove the cone spacer from the counterweight.
2. Pry out the seals using a screwdriver.
3. Remove the ball bearing by tapping with a socket and hammer.

Step 3 – Remove Seals and Bearings from Drive Arm:

1. Remove the cone spacer and push out the ball bearings from the drive arm hub.
2. If needed, use a screwdriver and hammer to tap out stubborn bearings.

Frequently Asked Questions (FAQ):
Q: How do I know if the shaft is bent and needs  replacement?
A: Roll the shaft on a flat surface to check for straightness.

#9822 SERVICE KIT

SR100/SR150 DRIVE ARM & COUNTERWEIGHT KIT

REQUIRED TOOLS

• Socket wrench (2), 11/16”
• 3/8” socket extension
• Pliers
• Retaining ring pliers
• Ball-peen hammer
• Flat-head screwdriver
• Punch
• Wood blocks (4)
• Flat piece of smooth metal or wood

DRIVE ARM DISASSEMBLY

1. STEP 1 – REMOVE DRIVE ARM

   • Remove one #6565 retaining ring from each drive arm bearing hub (left/right) using retaining ring pliers (see Fig. 1).

   • Using pliers, remove one #6602 end cap from each hub.

   • Using two socket wrenches (11/16” sockets), remove the #6603 nut from right end of the shaft. Push shaft in from right to left,  until it can be grasped by nut, then pull shaft completely out of the drive arm bearing hub. (See Fig. 2).

   • Remove remaining nut from shaft and roll shaft on flat surface to check for straightness. If bent, replace shaft (order separately, #8297).

   • Insert blade of screwdriver between right drive arm bearing hub and counterweight bearing hub as shown by arrow (1) in Fig.
     3. Work blade against #8327-001 spacer, and slide spacer and #6598 ball bearing in direction indicated by arrow (2) in Fig. 3.

   • Rotate right drive arm bearing hub up and remove drive arm from Big Gun (see Fig. 4.)

2. STEP 2 – REMOVE SEALS AND BEARINGS FROM COUNTERWEIGHT

   • As shown in Fig. 5, remove #6607-001 cone spacer from counterweight.
   • Insert screwdriver blade under lip of #6600 seal and pry seal out.
   • Turn counterweight over and remove opposite seal in same manner. Support counterweight as shown in Fig. 6.
   • Use a socket (7/8”) or similar tool with anoutside diameter slightly less than 1.25” (30 mm) and remove #6598 ball bearing by tapping on socket with ball-peen hammer

3. STEP 3 – REMOVE SEALS AND BEARINGS FROM DRIVE ARM

   • Starting with LEFT drive arm hub, remove #6607-001 cone spacer, and use finger pressure to push out #6598 ball bearing in the direction shown in Fig. 7. If finger pressure will not remove bearings, use a screwdriver and hammer to lightly tap bearings out, positioning the drive arm as shown in Fig. 9 on the following page.
   • In the RIGHT drive arm hub, push out the #8327-001 spacer and #6598 ball bearing in the direction shown in Fig. 8. See also Fig. 9 and caution on following page.
   • Support drive arm using wood blocks as shown in Fig. 9. Push #6600 seal out of hub with screwdriver (or punch) and hammer.
   • Turn drive arm over and remove #6600 seal from opposite hub.
   • Clean all foreign material from hub bores.
     CAUTION: Bore of RIGHT drive arm bearing hub contains retaining ring #6565. As shown in Fig. 8 and 9, this retaining ring is located between #6600 seal and

     6598 ball bearing. The seal and bearing must be removed in the correct

     direction, or else damage to the drive arm hub will result!

DRIVE ARM ASSEMBLY

1. STEP 1 – INSTALL NEW BEARING AND SEALS IN COUNTERWEIGHT
   

   • With counterweight on flat surface, place new #6598 ball bearing in the bore. Using same socket and hammer that were used to remove old bearing, press new bearing into bore (see Fig. 10). Make sure bearing is centered.

   • Fill both sides of bearing with #9821 grease.
     Position new #6600 seal over bore (flat side toward the bearing) as shown in Fig. 11. Place flat piece of smooth metal or wood on top of seal and use a hammer to lightly tap seal into bore until seal contacts the bearing.

   • Turn counterweight over and, in same manner, install new #6600 seal in bore. The bearing should remain centered with the seals inserted to equal depth.
     IMPORTANT: Do not remove lubricant from lip of #6600 seals. Lubricant minimizes friction between seals and spacers and is essential to proper operation.

2. STEP 2 – INSTALL NEW BEARINGS AND SEALS IN DRIVE ARM

   • From the outer side of the LEFT drive arm bearing hub, insert the #6598 ball bearing followed by the #13908 tool as shown in Fig. 12.

   • Place new #6600 seal over bore of LEFT hub from the inner side, with the flat side of the seal facing down. Place flat piece of Fig. 13.
     smooth metal or wood on top of seal. Insert punch or similar tool through bore of upper hub and let it rest on piece of metal or wood. Tap lightly on punch with a hammer and press seal squarely into bore of hub until seal and bearing bottom out on the #13908 tool as shown in Fig. 13.

   • Remove the #13908, turn drive arm over and press the #6600 seal into the RIGHT drive arm hub in the same manner as step 2- B (see Fig. 14) until the seal is flush with the face of hub or bottoms out on the retaining ring.

   • Working from outer side of RIGHT drive arm hub, insert one new #6598 ball bearing. Push the bearing into bore of hub with finger pressure (see Fig. 15).

3. STEP 3 – INSERT SPACERS INTO DRIVE ARM AND COUNTERWEIGHT
   

   • Insert new #8327-001 spacer into #6600 seal of RIGHT drive arm bearing hub from left to right (see Fig. 16). Push spacer in until flush with lip of seal. Pushing spacer in will also push bearing to the right.
   • Insert new #6607-001 cone spacer into #6600 seal of LEFT drive arm bearing hub.
   • Insert new #6607-001 cone spacer into #6600 seal located on inner side of counterweight (Fig. 17).

4. STEP 4 – REINSTALL DRIVE ARM AND COUNTERWEIGHT

   • Install #6603 nut on straight shoulder end of #8297 drive arm shaft with washer face of nut towards shaft (see Fig. 18). Screw nut all the way down until threads seat against shoulder of shaft.

   • Place the counterweight in alignment on RIGHT side of gun, resting on the bumper Fig. 19. of the shift lever (see Fig. 19). Grasp drive arm and hold vertically with drive vane down. Move drive arm hubs into position, engaging RIGHT bearing hub with counterweight. Roll LEFT bearing hub into position.
     

   • With finger pressure, push #6598 ball bearing and #8327-001 spacer of RIGHT bearing hub to left and into position (see Fig. 20).

   • Push #8297 drive arm shaft through bore of assembled components.

   • Install #6603 nut onto shaft with washer face of nut towards the tapered shoulder of the shaft (see Fig. 21). Torque nut to 25 ft-lbs (34 N-m).

5. STEP 5 – FINAL ASSEMBLY

   • Install new #6563 o-rings on #6602 caps.
   • Pack both caps and both drive arm hubs with grease from #9821 tube.
   • Using finger pressure, press caps into drive arm hubs. Excess lubricant will be forced out past seals and will purge hubs of air.
   • Install one #6565 retaining ring in each hub, over the cap.

WARRANTY AND DISCLAIMER

Nelson Big Gun® Sprinklers and accessories are warranted for one year from date of original sale to be free of defective materials and workmanship when used within the working 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 resulting from 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, employee or representative of the manufacturer has authority to waive, alter or add to the provisions of this warranty, nor to make any representations or warranty not contained herein. Products in this brochure may be covered by one or more U.S Patents and other U.S. Patents pending or corresponding issued or pending foreign patents. See www.nicpat.com for details.

Nelson Irrigation Corporation 848 Airport Rd. Walla Walla, WA 99362-2271 USA Tel: 509.525.7660 Fax: 509.525.7907 info@nelsonirrigation.com www.nelsonirrigation.com

References

• Nelson Irrigation
• Nelson Irrigation Patents

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