How do I install my hydraulic Graco Reactor?

Prior to operation, you must properly install your hydraulic Graco Reactor.

Regardless of which polyurethane foam or polyurea coatings you will be spraying, you must first install your hydraulic Graco Reactor. This step-by-step guide contains the information you need to set up and safely operate your new machine.

Note: This step-by-step guide walks you through setting up your machine. This document is not replacing the manual, for a full overview of safety instructions please see the manual.


Assemble the Proportioner

  1. Remove bolts and nuts.
  2. Swing the electrical enclosure upright. 
  3. Reinstall bolt with nut. Tighten bolt and nut.
  4. Position the cable bundles against the frame. Attach the bundles to the frame with a loose wire tie on each side.

Mounting the System

NOTE: Wall mounting brackets are not included with the system. Evaluate the installation to determine if additional support is required beyond the floor mounting screws.

  1. See Dimensions, page 74  in the manual for mounting hole specifications.
  2. Use a minimum of 4 of the 6 mounting holes, evenly spaced in the base of the system frame, to secure base to the floor. 

NOTE: Bolts are not included




WARNING: The equipment must be grounded to reduce the risk of static sparking and electric shock. Electric or static sparking can cause fumes to ignite or explode. Improper grounding can cause electric shock. Grounding provides an escape wire for the electric current.

  • Reactor: System is grounded through the power cord.
  • Spray gun: connect whip hose ground wire to FTS. See Install Fluid Temperature Sensor, page 33 in the manual. Do not disconnect ground wire or spray without whip hose.
  • Fluid supply containers: follow your local code.
  • Object being sprayed: follow your local code.
  • Solvent pails used when flushing: follow your local code. Use only metal pails, which are conductive, placed on a grounded surface. Do not place pail on a nonconductive surface, such as paper or cardboard, which interrupts grounding continuity.
  • To maintain grounding continuity when flushing or relieving pressure, hold a metal part of spray gun firmly to the side of a grounded metal pail, then trigger gun.

General Equipment Guidelines

NOTICE: Failure to properly size the equipment may result in damage. To avoid damage to the equipment, follow the guidelines listed below.

  • Determine the correct size generator. Using the correct size generator and proper air compressor will enable the proportioner to run at a nearly constant RPM. Failure to do so will cause voltage fluctuations that can damage electrical equipment. Ensure that the generator matches the voltage and phase of the proportioner. 

Use the following procedure to determine the correct size generator.

  1. List peak wattage requirements of all system components.
  2. Add the wattage required by the system components.
  3. Perform the following equation: Total watts x 1.25 = kVA (kilovolt-amperes)
  4. Select a generator size that is equal to or greater than the determined kVA.
  • Use the electrical rating in the models section (see Models, page 9 in the manual ) to determine the correct size power cord.

NOTICE: Undersized power cords can cause voltage fluctuations that can damage electrical equipment and may cause the power cable to overheat.

  • Use an air compressor with continuous run head unloading devices. Direct online air compressors that start and stop during a job will cause voltage fluctuations that can damage electrical equipment.
  • Maintain and inspect the generator, air compressor, and other equipment per the manufacturer recommendations to avoid an unexpected shutdown. Unexpected equipment shutdown will cause voltage fluctuations that can damage electrical equipment.
  • Use a utility power service with enough current to meet system requirements. Failure to do so will cause voltage fluctuations that can damage electrical equipment.

Connect Power

WARNING: All electrical wiring must be done by a qualified electrician and comply with all local codes and regulations.

  1. Turn main power switch OFF. 
  2. Open electrical enclosure door.
  3. NOTE: Terminal jumpers are located inside the electrical enclosure door if equipped.
  4. Install supplied terminal jumpers in the positions shown in image for the power source used (H-30 and H-XP2 models only).
  5. Route power cable through strain relief in electrical enclosure.
  6. Connect incoming power wires as shown in image. Gently pull on all connections to verify they are properly secured.
  7. Verify all items are connected properly as shown in image then close electrical enclosure door.

Lubrication System Setup

Component A (ISO) Pump: Fill ISO lube reservoir with Graco Throat Seal Liquid (TSL), part 206995 (supplied).

  1. Lift the lubricant reservoir out of the bracket and remove the container from the cap.
  2. Fill with fresh lubricant. Thread the reservoir onto the cap assembly and place it in the bracket.
  3. Push the larger diameter supply tube approximately 1/3 of the way into the reservoir.
  4. Push the smaller diameter return tube into the reservoir until it reaches the bottom. 
  5. NOTE: The return must reach the bottom of the reservoir to ensure that isocyanate crystals will settle to the bottom and not be siphoned into the supply tube and returned to the pump.
  6. The lubrication is ready for operation. No priming is required.

Install Fluid Temperature Sensor

The Fluid Temperature Sensor (FTS) is supplied. Install FTS between main hose and whip hose (see your heated hose manual).


Connect Heated Hose to Proportioner

NOTICE: To avoid damage to the hose, only connect Reactor 2 proportioners to genuine Graco heated hoses.

Refer to your heated hose manual for detailed connection instructions. 

  1. Turn off the main power switch. 
  2. Remove cover.
  3. For proportioners with electrical splice connectors: 
    1. Connect hose power wires to electrical splice connectors from the proportioner. Wrap connectors with electrical tape.
  4. Route heated hose wires through strain relief and install wires into the open screw terminals on the terminal block. Torque to 35 in-lb (3.95 N•m).
  5. Reinstall cover.

Have Questions? Let's Talk



We’ll help you choose the right product for your job.

Contact Us

Contact Us

You'll hear from us within 24 hours.