Graco PR70 Series - User Manual

Questions and Answers

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Bob MillsJul 26, 2025
What to do if the piston stalled on my Graco PR70 (E21 Error)?
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  Holly LandryJul 27, 2025
  If the piston is stalled on your Graco Dispenser (E21 Error), it might be due to several reasons. First, check if the input air is reduced or removed; reconnect the input air line to the machine and increase the air pressure regulator adjustment. A blocked mixer can also cause this issue; replace the static mixer and consider incorporating or decreasing purge time to prevent future blockages. The ODV adjustment may be too late, so readjust the ODV setting to occur sooner. Additionally, a blocked check valve can cause this problem; remove, clean, and replace the check valve. Finally, an air cylinder failure might be the cause; remove the air cylinder and reinstall cylinder kit items if necessary.
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Eric HarperAug 4, 2025
Why is my Graco PR70 Dispenser dispensing off ratio?
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  Heidi GarciaAug 4, 2025
  If your Graco Dispenser is dispensing off ratio, it could be due to several reasons. Check the tank levels and add material if necessary, as one tank might be empty. Ensure the tank ball valve is open and re-prime the machine. The machine might be out of phase, so re-phase it. Additionally, a check valve malfunction or worn/broken pistons could be the cause; in this case, remove and clean or replace the check valve(s) if necessary, and remove and replace the piston(s) if necessary.
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Nicole CampbellAug 9, 2025
How to fix a completely dark HMI display on a Graco PR70?
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  kathrynmurilloAug 9, 2025
  If the HMI display on your Graco Dispenser is completely dark, there are several potential causes. First, verify that the rear AC power switch is turned ON. If that's not the issue, check if a fuse has blown and replace the machine fuses if necessary. A loose connection could also be the problem, so tighten the 5-pin cable on the HMI. Finally, the HMI itself might be faulty, in which case it should be replaced.
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Jeffrey BurnsAug 12, 2025
What to do if no material is dispensed from my Graco Dispenser?
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  Shannon FarleyAug 13, 2025
  If you're getting no material or an incorrect amount of material dispensed from either side of your Graco Dispenser, several issues could be at play. Ensure the tank ball valve is open, if installed. Check that the tank is not empty and fill it with material if needed. Verify there are no obstructions in the tank. Air in the material can also cause this problem, so prime the machine until the air is removed. A check valve malfunction could be the cause; remove, clean, or replace the check valve. Lastly, a worn or broken piston can lead to this issue; remove and replace the piston if it is worn.
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Jeffery StokesAug 17, 2025
Why is there significant material leaking from the pump rear seal on my Graco PR70 Dispenser?
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  Vincent MillerAug 17, 2025
  If there is significant material leaking from the pump rear seal of your Graco Dispenser, it is likely due to a worn pump shaft. To resolve this, remove the pump shaft assembly and reinstall the rear pump rebuilt kit.
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Keith WoodAug 21, 2025
Why are the pumps drawing material back from the valve hose on my Graco Dispenser?
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  Michael GatesAug 22, 2025
  If the pumps are drawing material back from the valve hose on your Graco Dispenser, it's likely due to a check valve stuck open. Remove the check valve(s), clean, or replace if necessary.
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Alexandra RichardsonOct 30, 2025
What to do if the material dispensed is not the correct weight from my Graco PR70 Dispenser?
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  Gabriela JohnsonOct 30, 2025
  If the Graco Dispenser is dispensing an incorrect weight of material, several factors could be the cause. The specific gravity of one or both materials may have changed since calibration; in this case, mix the materials in the tanks, dispense another shot, and re-weigh. If necessary, recalibrate the machine. Also, the machine's air pressure may have changed since calibration; readjust the air pressure regulator to the value used during calibration, or recalibrate. Ensure there is enough material in the tanks, filling and priming if necessary. A slight obstruction in the mixer can also cause this issue, so replace the static mixer and re-prime the machine. Finally, check valve malfunction or worn or broken pistons can contribute to this problem; remove and clean or replace the check valves ...

Summary

Models

2007 Product Configurator - PR70

Describes the system's configurable options and part numbering.

Safety Warnings

Electric Shock Hazard

Details electrical safety risks and necessary precautions.

Skin Injection Hazard

Explains the danger of high-pressure fluid injection.

Toxic Fluid or Fumes Hazard

Covers risks associated with hazardous materials.

Fire and Explosion Hazard

Outlines precautions for flammable environments.

Equipment Misuse Hazard

Warns against improper operation and modifications.

Moving Parts Hazard

Highlights dangers from mechanical movement.

Personal Protective Equipment (PPE)

Recommends safety gear for operators.

HMI Operation and Controls

HMI Control Panel Layout

Describes the physical controls and display of the HMI.

HMI Control Key and Functions

Explains the purpose of each button and indicator.

Run Screen Operations

Main Run Screen Overview

Screen Navigation Diagram

PR70 HMI Navigation Flow

Visual guide showing the sequence between HMI screens.

Priming and Calibration

Machine Priming Procedure

Piston Position Calibration (C1)

Calibrating piston travel limits for accurate dispensing.

Phasing Calibration (C2)

Adjusting material flow for proper mixing ratio.

Open Dispense Valve (ODV) Setting (C3)

Machine Calibration Shots (C4)

Performing shots to calibrate dispensing volume.

Shot Size Definition (M2)

Ratio Checks Procedure

Password Management

Password Setup and Clearing Options

Administrative Password Configuration

Maintenance-Only Password Configuration

Procedures and Error Handling

Pressure Relief Procedure

Safely depressurizing the system.

Error Code Reporting

How the machine indicates and displays faults.

Error Code Reference Table

Comprehensive list of error codes, causes, and solutions.

ICON Reference Tables

PR70 HMI ICON Descriptions

PR70 Screen-Specific ICONs

PR70 Screen-Specific ICONs (Continued)

Maintenance and Software Updates

Routine Maintenance Tasks

Troubleshooting Guide

Troubleshooting Common Issues

A guide to diagnosing and resolving operational problems.

Wiring Diagrams

PR70 Wiring Interconnect Diagram

Illustration of electrical connections between system modules.

Detailed PR70 Wiring Diagram

Comprehensive schematic of electrical pathways.

Technical Specifications

PR70 Technical Data Summary

Key performance, operational, and environmental specifications.

Physical Dimensions

Graco PR70 Series Specifications

General

Power Supply	Pneumatic
Air Inlet Pressure	0.5 - 0.7 MPa (5 - 7 bar, 70 - 100 psi)
Wetted Parts	Stainless Steel, PTFE, UHMWPE
Viscosity Range	Up to 1, 000, 000 cps
Pump Type	Positive displacement
Ratio Range	1:1 to 10:1
Dispensing Capacity	Variable, depending on configuration
Dimensions	Variable, depending on configuration

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