Toro 91764SL User Manual

Water Pump Clutch: Electromagnetic, dual groove belt 
drive for water pump and driveshaft flange  brake/clutch 
for main valve gearbox. 

Air gap 0.018 in. 

Pre Filter – Spin down type with washable cartridge in 
clear plastic housing and plastic ball valve for flushing. 

Supply Filter – Replaceable 5 micron cartridge in plas-
tic housing with air bleed button. 

Water Filter Cartridge: Toro part no. 86–8630 

Water Pressure Switch – Senses for water pressure 
after filter. 

Switch closes when pressure is over 20–28 PSI and 
opens when pressure drops below 7–13 PSI. 

Pump – Current pump (Model 09801) is a Toro exclu-
sive design (patent pending) with cast stainless steel 
head and 3 piston plungers. Vee packing seals and Ke-
vlar guides. Forged crankshaft with plasma sprayed ce-
ramic on stainless steel plungers and cast iron 
connecting rods. 

Nominal performance is 4 GPM at 5000 PSI with 
1400 RPM input. 

Accumulator – Toro exclusive design with low charge 
pressure sensor. 

Charged with nitrogen gas charged to 2500 PSI 
maximum pressure. 

Cam and Gearbox – Reduction gear drive for cam that 
actuates main water valve. Roller cam follower rides on 
cam specifically designed (patent pending) to control 
water injection at 5.3 cycles per second (320 rpm) and 
store energy in accumulator between injections. Cast 
iron case also serves as 4 quart hydraulic reservoir. 

Valve  – Cast stainless steel valve body functions as 
mounting base for accumulator, gearbox and manifold 
outlet. All high pressure water flows in and out through 
the valve body. Pressure balanced valve spool with 
floating (patent pending), hardened stainless seat 
aligns during assembly. Bleed valve in base allows for 
bleed–off of high pressure and drain down for cold 
weather storage. Bolted flanges and polyurethane O– 
rings mate all components to valve body. 

Valve lift:  0.100 

+0.002 

–0.04

 inch (with new cam) 

Rollers – Pivoting aluminum rollers uniformly smooth 
the turf and provide protection from the nozzle dis-
charge. Adjustable flow (0 – 3 GPM) spray wash system 
with 6 flood tip nozzles maintain clean rollers. 
Specifications 

Pressure Relief Valve – Poppet–type valve with corro-
sion resistant stainless and brass materials. 

5000 + 300 PSI relief valve pressure. 

Manifold and Nozzles – Extruded stainless steel man-
ifold with11 flanged nozzle extensions containing check 
valves and hardened stainless discharge orifice. Check 
valves may be reversed in housing to block unused 
nozzles. 

Aeration Width: 33 inches with 11 nozzles on 3 inch 
centers. 

Aeration Depth: 4 to 6 inches depending on turf condi-
tions and nozzle configuration. 

Hole Pattern: Variable from 1.5” to 6” spacing in the di-
rection of travel, and 3 or 6” increments in width. 

Water Pump Case Oil – Mobil DTE Extra Heavy or oth-
er interchangeable ISO Grade 150 PE–700–A (Heavy 
Inhibited Hydraulic & General Purpose) See following 
chart for equivalent oils. 

Mobil 

DTE EH (Extra Heavy) 

Shell 

Turbo 150 

Amoco 

American Ind. Oil 150 

Chevron 

AW Machine Oil 150 

Conoco 

Dectol R & O150 

Exxon 

Terresstic 150 

Kendall 

Ken–Tran 080 

Pennzoil 

Penreco 150/AW150 

Phillips 

Magnus Oil 150 

Standard 

Energol HLP 150 

Sun 

Sunvis 150 

Union 

Unax RX 150/Turbine Oil 150 

Valvoline 

ETC (R&O) #70 

Water Supply – Recommend a source with 7–8 gallons 
per minute. A minimum pressure of 30 psi at the ma-
chine is required for the pump to engage. Maximum al-
lowable pressure of 200 psi. Although irrigation water 
pumped from ponds or effluent holding pools can be 
used, not all conditions can be handled by the machines 
filtration system, additional or alternative filtration may 
be required. 

Hydroject 3000

Rev. B