User manual Toro 640

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4
5
6
. With the valve depressed, grasp snap ring "ears" with TORO snap ring pliers  
(Model No. 995-07), release snap ring from groove and remove from body.  
Body  
. Remove valve mechanism with TORO Valve Removal Tool (Model No. 995-08) or  
carefully grasp one valve rib with snap ring pliers, pulling valve up and out of body.  
Snap  
Ring  
. Reassemble valve mechanism in reverse order.  
Note: Due to limited work space in 640 sprinklers, use of Toro Valve Insertion Tool  
(Model No. 995-35) is recommended to simplify valve and snap ring installation.  
Valve  
7. See Reinstalling Nozzle/Drive Assembly.  
Changing Nozzle and Stator  
Note: Nozzle changes may be accomplished by  
changing the entire nozzle assembly or by removing  
the nozzle container end changing only the upper  
nozzle. In either case, the appropriate matching  
stator must be installed (i.e., No. 42 Nozzle and No.  
FIGURE 2  
42 Stator, etc.) to ensure proper sprinkler operation.  
Nozzle  
Assembly  
Changing Complete Nozzle Assembly  
1
2
3
. Remove cap set screw with 1/3 in. hex wrench and  
unscrew cap.  
. Remove nozzle container seal, nozzle retainer and  
nozzle/drive assembly from body.  
Set Screw  
. Remove 1/16 in. allen set screw in side of nozzle  
canister.  
4. Unscrew nozzle assembly from drive assembly.  
5. Assure nozzle seal is located at bottom of nozzle  
base threads.  
6. Install new nozzle assembly — HAND-TIGHTEN  
ONLY, DO NOT OVER-TORQUE.  
Drive  
Assembly  
7. Turn set screw clockwise until contact with riser  
threads is made (see CAUTION below).  
CAUTION  
Do not over-torque set screw. Over-tightening  
will cause thread damage and possible water  
leak between lower nozzle base and drive  
assembly.  
8. Remove boss on nozzle rubber cover to identify drive  
assembly arc.  
2

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