Toro 640 User Manual

Installation Procedure

To assure maximum performance from your 640 Series
Rotary Sprinklers, read these instructions completely prior to
installing or servicing the sprinkler.

Construct Swing Joints

1. Construct triple swing joints for each sprinkler as shown
in Figure 1. Use PVC or ABS pipe nipple for sprinkler
connection.

Note: On sites where the possibility of heavy equipment
rolling over a sprinkler exists, the swing joint will flex
preventing damage to the lateral or main lines. On a new
installation in raw ground where the sprinklers are to be
initially installed above the finished grade and lowered
when new turf is established, the swing joint allows
sprinkler repositioning without changing risers. This is a
common and practical procedure which eliminates the
problem of dirt being accidentally introduced into the
lateral lines when a riser is changed.

2. Flush lines thoroughly prior to installing sprinkler.

3. Apply Teflon

™

tape on riser threads. Install sprinkler to

riser and tighten.

CAUTION
Use only Teflon tape on riser threads. Use of pipe dope or other types of sealing compounds can
cause deterioration of plastic threads and components.

4. Install sprinkler on riser. Align part-circle heads by rotating sprinkler body on riser until radius adjustment slot on top of the nozzle
rubber cover is positioned to the left side of the intended coverage area.

5. Valve-In-head models only: Remove tube retainer and cap from sprinkler fitting. Provide a service loop in control tube at
sprinkler to prevent binding. Slide tube retainer over end of control tube. Push control tube onto sprinkler fitting and secure with
tube retainer.

6. Install sprinklers flush with grade to 1/2 in. (0–13mm) below grade.

7. Backfill and compact soil around sprinkler avoiding contact with nozzle assembly.

Servicing the Sprinkler

Valve Replacement

WARNING

POSITIVELY SHUT OFF WATER SUPPLY AT SOURCE PRIOR TO DISASSEMBLING SPRINKLER.
BLEED ALL PRESSURE FROM SPRINKLER SYSTEM INCLUDING CONTROL TUBES. FAILURE TO
DEPRESSURIZE SYSTEM PRIOR TO VALVE SNAP RING REMOVALMAY CAUSE VALVE MECHANISM
TO FORCIBLY EJECT FROM SPRINKLER BODY RESULTING IN POSSIBLE SERIOUS INJURY.

1. Remove cap set screw with 1/8 in. hex wrench and unscrew cap.

2. Remove nozzle container seal, nozzle retainer and nozzle/drive assembly from body.

3. Depress valve mechanism using a long screwdriver or similar tool (see CAUTION below).

CAUTION
Do not continue valve removal procedure if the valve cannot be pressed
down with minimum force. Confirm that water pressure is off and the
control tube is bled before continuing.

1

Installation and Service Instructions

640 Series Rotary Sprinkler

0 in.–1/2 in. (0–13mm)

FIGURE 1

Body

Snap

Ring

Valve

4. 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.

5. 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.

6. 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.

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.
42 Stator, etc.) to ensure proper sprinkler operation.

Changing Complete Nozzle Assembly

1. Remove cap set screw with 1/3 in. hex wrench and
unscrew cap.

2. Remove nozzle container seal, nozzle retainer and
nozzle/drive assembly from body.

3. 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.

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

FIGURE 2

Body

Valve

Set Screw

Drive

Assembly

Nozzle

Assembly

Snap

Ring