Nelson Irrigation Corporation 848 Airport Rd. Walla Walla, WA 99362-2271 USA Tel: 509.525.7660 Fax: 509.525.7907 [email protected] Web site: www.nelsonirrigation.com
SR75 BIG GUN MAINTENANCE
10/13
REASSEMBLY
STEP 1 (Shift Lever)
Slide #10226-004 shift lever onto
mount. Snap the #8323-212
retaining ring onto the mount.
Replace the #10364 cap and the
two #8311 screws.
STEP 2 (Drive Arm)
Assure the #10377 O-ring and
#10193 spacer is on the drive arm
shaft. Push the shaft all the way
into the right arm hub. From the
left side slide onto the arm shaft,
in sequence, the #10214 spacer,
#6598 bearing, #10194 spacer,
#10191 cam.
STEP 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. Torque to 25
ft. lbs. using the
11
/
16
” socket (metric
torque = 34 NM or 3.5 MKG).
Replace the lubricant.
SEE FRONT FOR DRIVE ARM ASSEMBLY COMPONENTS / SEE SR75 PARTS LIST FOR COMPLETE PARTS LIST AND DESCRIPTIONS
STEP 6
Replace the #10231 cap making
sure that the notch on the #10231
engages the spring tab on the
#10189.
STEP 7
Replace the 4 #8311 screws. Make
sure the drive arm rotates freely and
returns to its at-rest position.
3