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Graco Husky 307 - User Manual

Graco Husky 307
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ACETAL AND POLYPROPYLENE
Husky™ 307 Air–Operated
Diaphragm Pumps
100 psi (0.7 MPa, 7 bar) Maximum Fluid Working Pressure
100 psi (0.7 MPa, 7 bar) Maximum Air Input Pressure
*Model No. D31 Acetal Pumps, Series E
*Model No. D32
Polypropylene Pumps, Series E
*Model No. D3A Acetal BSPT Pumps, Series E
*Model No. D3B Polypropylene BSPT Pumps, Series E
* To determine the Model No. for your pump and for additional models, refer to the Pump Matrix
on page 26.
Patent No.
US 5,240,390
US 5,280,808
Instructions–Parts List
308553AF
Important Safety Instructions
Read all warnings and instructions in this manual.
Save these instructions.
01428B

Table of Contents

Questions and Answers

  • T
    Thomas GibsonAug 16, 2025
    Why are there air bubbles in the fluid from my Graco Water Pump?
    • V
      veronica98Aug 16, 2025
      Air bubbles in the fluid can be caused by several issues. The suction line may be loose or lack thread sealant; tighten it and apply a compatible liquid thread sealant or PTFE tape. A ruptured diaphragm can also cause this, so you may need to replace the diaphragm. Check if the manifolds are loose or if the o-rings are damaged; tighten the manifold bolts or nuts and replace the o-rings if needed. Lastly, ensure the outer diaphragm plates are tightened.
  • H
    hwestAug 22, 2025
    How to fix a Graco Husky 307 Water Pump that won't cycle?
    • M
      michael94Aug 22, 2025
      If your pump isn't cycling, it could be due to a few reasons. The air valve might be stuck or dirty; try turning the reset shaft, or disassemble and clean the air valve using filtered air. Another possibility is a worn or broken detent link; replace the detent link and ball. Also, check the springs, valve cup, and plate for damage and replace them if necessary.
  • H
    Harry LivingstonAug 26, 2025
    Why is there fluid in the exhaust air of my Graco Husky 307?
    • A
      Alicia WoodAug 26, 2025
      Fluid in the exhaust air usually indicates a ruptured diaphragm. Replace the diaphragm. It can also be caused by loose outer diaphragm plates, so ensure that the plates are tightened.
  • T
    Tina BatesAug 28, 2025
    What causes a Graco Water Pump to cycle at stall or fail to hold pressure?
    • F
      fullerjamesAug 28, 2025
      If your pump cycles at stall or fails to hold pressure, it could be due to leaking check valves or o-rings; in this case, replace these parts. It may also be caused by worn check balls or seats, which would also need replacement. Another possibility is a check ball wedged in the seat; try replacing the ball.
  • C
    Carolyn AlexanderAug 31, 2025
    Why is my Graco Husky 307 leaking excessive air from the exhaust port?
    • A
      Angel DanielAug 31, 2025
      Excessive air leakage from the exhaust port can occur if the air valve cup or plate is worn; replace these parts. Another cause could be worn shaft seals, which would also need replacement.
  • J
    james90Sep 3, 2025
    Why does my Graco Water Pump exhaust air at stall?
    • A
      Aaron WarnerSep 3, 2025
      If your pump exhausts air at stall, it could be because the air valve cup or plate is worn, so replace these parts. Alternatively, the shaft seals may be worn, requiring replacement.
  • G
    Glenn SmithSep 6, 2025
    Why is my Graco Husky 307 Water Pump exhausting air near the air valve?
    • N
      nathanjonesSep 6, 2025
      If your pump is exhausting air near the air valve, first check if the air valve screws are loose and tighten them. If that's not the issue, inspect the air valve o-ring for damage and replace it if necessary.
  • C
    christopher53Sep 9, 2025
    Why is my Graco Husky 307 Water Pump leaking fluid from the check valves?
    • S
      Samantha ValentineSep 9, 2025
      Fluid leaking from the check valves indicates that the o-rings are worn or damaged. Inspect and replace the o-rings.
  • L
    Linda TorresSep 10, 2025
    What to do if my Graco Water Pump operates erratically?
    • M
      Mr. James MelendezSep 12, 2025
      Erratic pump operation can stem from a few causes. First, inspect the suction line for clogs and clear any obstructions. Second, check the valve balls; if they are sticking or leaking, clean or replace them. Lastly, a ruptured diaphragm can cause this issue, so consider replacing it.
  • T
    Travis HernandezSep 12, 2025
    Why is my Graco Water Pump exhausting air from the clamps?
    • J
      John RangelSep 12, 2025
      If your pump is exhausting air from the clamps, it means the clamps are loose. Tighten the clamp nuts.

Summary

Husky 307 Pump Introduction

Safety Warnings and Symbols

Warning and Caution Symbols

Explanation of warning and caution symbols used in the manual.

Equipment Misuse Hazards

Details hazards and precautions related to equipment misuse.

Installation Safety Precautions

Toxic Fluid Hazards

Information on hazards associated with toxic fluids and necessary precautions.

Fire and Explosion Hazards

Safety guidelines to prevent fire and explosion risks.

General Installation Guidance

Safe Operating Temperatures

Specifies the acceptable temperature range for pump operation.

Fastener Tightening Procedure

Guidance on proper torque for threaded connections before first use.

Mounting and Manifold Options

Instructions for mounting the pump and information on dual manifold kits.

System Grounding Requirements

Air and Fluid Line Connections

Air Line Setup and Components

Instructions for connecting and configuring the air supply lines.

Fluid Suction Line Installation

Guidance on connecting the fluid suction line and its implications.

Fluid Outlet Line Setup

Instructions for connecting the fluid outlet line and related components.

Fluid Port and Pressure Relief Valve

Changing Fluid Port Orientation

Steps to change the direction of fluid inlet and outlet ports.

Fluid Pressure Relief Valve Installation

How to install a pressure relief valve to prevent overpressurization.

Common Installation Configurations

Stand-Mounted Air Spray Installation

Diagram and components for stand-mounted air spray setup.

Pail-Mounted HVLP Air Spray Installation

Diagram and components for pail-mounted HVLP air spray setup.

Alternative Installation Configurations

Bung-Mount Transfer Installation

Diagram and components for bung-mount transfer setup.

Wall-Mount Transfer Installation

Diagram and components for wall-mount transfer setup.

Air Exhaust Ventilation

Pump Operation Procedures

Pressure Relief and Shutdown

Step-by-step guides to safely relieve system pressure and shut down the pump.

Flushing the Pump

Instructions for flushing the pump before first use or storage.

Starting and Adjusting the Pump

Guide to safely starting, priming, and adjusting pump operation.

Troubleshooting Pump Issues

Routine Maintenance Tasks

Lubrication Guidelines

Guidelines for lubricating the air valve and cautions.

Procedural Maintenance

Instructions for flushing, storage, and tightening threaded connections.

Preventive Maintenance Schedule

Recommendations for establishing a preventive maintenance plan.

Service - Replacing Air Valve

Service - Repairing Air Valve

Service - Air Valve Reassembly

Service - Ball Check Valve Maintenance

Service - Diaphragm Repair

Service - Diaphragm Reassembly

Husky 307 Pump Model Identification

Husky 307 Repair Kit Selection

Parts Identification - Air Motor

Parts Identification - Fluid Section

Parts Identification - Fluid Components

Seat Parts

List of part numbers and descriptions for seat components.

Ball Parts

List of part numbers and descriptions for ball components.

Diaphragm Parts

List of part numbers and descriptions for diaphragm components.

Torque Sequence Specifications

Technical Data - PTFE Diaphragm Pumps

Technical Data - TPE;Buna-N Diaphragm Pumps

Pump Physical Dimensions

Graco Warranty and Information

Standard Pump Warranty

Details the standard warranty terms for Graco Husky pumps.

Extended Warranty Details

Information on the extended warranty for air valve center sections.

Contact and Support Information

Contact details and general information about Graco.

Graco Husky 307 Specifications

General IconGeneral
Maximum Flow Rate7 gpm (26.5 lpm)
Maximum Fluid Pressure100 psi (7 bar)
Maximum Operating Temperature150°F (66°C)
Weight6.5 lbs (2.95 kg)
Fluid Inlet Size3/8 in npt(f)
Fluid Outlet Size3/8 in npt(f)
Wetted PartsPolypropylene, Santoprene
Inlet Size3/8" NPT
Outlet Size3/8" NPT
Air Inlet Size1/4" NPT

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