valutazioni - 3, GPA: 3.3 ( )

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Alignment of the heads is critical for proper performance. The model 696 sprinkler is a two-speed head with two 60° and two 120° arcs of speed. A red button on the drive assembly indicates it is a two-speed 60°–120° head and acts as a pointer toward the center of the fairway or the next head in the row of sprinklers. The model 698 sprinkler is a two-speed head with two 180° arcs of speed. A yellow button on the drive assembly indicates it is a two-speed 180° head and also indicates the center of the regular speed side. Align the sprinkler so the button points toward the center of the overlapped area of coverage. When a nozzle assembly is changed on either the 696 or 698 head, the main nozzle must be aligned with the small boss on the bull gear of the drive assembly. Align main nozzle directly over raised timing mark on bull gear. 120. Regular Speed 60. Half Speed 120. Regular Speed 60. Half Speed 180. Half Speed 180. Half Speed Align yellow dot facing opposing sprinkler row. (Two row design) Align yellow dot with center of green. (Green application) Figure 2 -Nozzle Alignment Figure 3 -Alignment of Drive Assembly to Turf Coverage Area Back Nozzle Alignment When replacing the back nozzle, align it so the nozzles are vertical and the ramp is parallel to the ground. Use a 5/8 in. wrench to remove and align the back nozzle. See example at right. Pilot Valve Operation PARALLEL GROUND LINEL RAMP ALIGNMENTL The main function of the pilot valve is to control the operation of the main valve located in the base of the sprinkler body. The main valve is operated by the release of water metered through the pilot valve when it is activated either manually or automatically by the 24 VAC coil assembly. Another important function of the pilot valve is to regulate the water pressure to the sprinkler nozzle. Pressure regulation compensates for large variations within the system and maintains a constant pressure for optimum sprinkler operation. The 690 series pilot valve is factory set to regulate at 80 or 100 PSI depending on sprinkler model. Sprinkler operation mode is set using a Toro Selector Tool (P/N 995-15) inserted through the body flange onto the pilot valve D shaped selector-cam. The "AUTO" mode permits automatic operation from the system controller. The "ON" mode opens the main valve for manual operation and "OFF" mode prevents the main valve from opening. System Troubleshooting Pilot Valve Possible equipment failures with causes and corrective action are listed below. PROBLEM POSSIBLE CAUSE – CORRECTIVE ACTION 1. Sprinkler will not turn on (a) No 24 VAC to coil assembly - Measure voltage with DVM. Check wiring and controller program - Refer to Controller Operating Instructions. (b) Selector cam in "OFF" position - Set to "AUTO" position. (c) Debris in pilot valve assembly - Disassemble and remove all debris (See Servicing Pilot Valve page 8.) 2. Sprinkler will not shut off (a) Constant 24 VAC from controller - Check for voltage using a DVM. If voltage is present, disconnect wire. If sprinkler closes, service controller. Refer to Controller Service Manual. (b) Selector cam in manual "ON" position - Set to "AUTO" or "OFF" position. (c) Debris in pilot valve assembly - Disassemble and remove all debris (See Servicing Pilot Valve page 8.) 4 System Troubleshooting (continued) Sprinklers Possible equipment failures with causes and corrective action are listed below. PROBLEM POSSIBLE CAUSE – CORRECTIVE ACTION 1. Sprinkler won't rotate (a) Stator too large for nozzle - Use proper nozzle. (b) Debris wedged between stator and turbine - Remove obstruction. (c) Drive assembly defective - Replace with new drive assembly. 2. Head sticks up (a) Dirt in riser assembly - Flush out. (See Flushing Procedure.) (b) Damaged riser - Replace. 3. Poor distribution pattern (a) Nozzle plugged with debris - Clean or replace nozzle. (b) Nozzle orifice/stream straightener damaged - Replace nozzle. (c) Low operating pressure - Determine why system overloaded and correct. (d) Head misaligned during installation (two-speed only) - Realign properly. 4. Valve won't close (a) Leak in control tubing - Isolate and repair. (Hydraulic 69X-01-XX) (b) Pilot valve leak in controller - Confirm by observing constant dripping from discharge line of controller. Refer to Controller Service Manual. (c) Foreign object keeping valve from seating - Remove, clean and check valve for damage. Replace if necessary. (d) Damaged piston seal or piston assembly - Replace valve assembly. (e) Valve not properly communicated to tube in body - Reassemble if necessary. 5. Valve won't open (a) Plugged controller discharge line or discharge port in pilot valve ( Hydraulic 69X-01-XX) Verify by checking for discharge at discharge line when station is activated - If no discharge, refer to Controller Service Manual. (b) Water supply to sprinkler closed off - Determine if closure is shut-off valve or blockage and correct. 6. Valve won't close (a) Leak in pilot valve assembly - Replace ...

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