Macnaught HG20F-01, HG20R-01, HG20R-02 Instruction Manual

HG616 Issue 10 © 2017 1

HG 20R(Rigid) & HG20F (Flexible)

OIL CONTROL GUNS

INSTRUCTION MANUAL

INTRODUCTION

Thank you for purchasing a Macnaught oil dispensing
gun complete with either a flexible or rigid extension.
The Macnaught oil dispensing guns have been
designed for use with engine oil, gear oil, automatic
transmission fluid, anti-freeze/anti-boil and compatible
fluids.

Macnaught also manufacture a complete range of ratio
oil pumps and retractable oil hose reels, greasing
equipment and accessories to fulfil all your fluid
handling and greasing needs requirements.

Please read and retain this instruction manual to
assist you in the operation and maintenance of this
quality product.

GENERAL INFORMATION

This manual assists you in operating and maintaining your
new oil control gun. The information contained will help
you ensure many years of dependable performance and
trouble free operation.

Please take a few moments to read through this manual
before installing and operating your new oil control gun. If
you experience problems with this product, refer to the
trouble shooting sections of this manual. If you require
further assistance please contact your local Macnaught
distributor or authorised Macnaught service centre.

IMPORTANT INFORMATION

Your safety is important to us. Please read and follow
all safety instructions listed inside.

Some of these instructions alert you to the potential
for personal injury. “Cautions” listed throughout this
manual advise of potential practices or procedures
which may cause damage to your equipment.

Ensure all operators have access to adequate
instructions about safe operating and maintenance
procedures.

Do not exceed the maximum working pressure of 6900
kPa / 1000 psi / 69 bar.

Do not hit the oil control gun if it fails to operate. Refer
to “trouble shooting guide” or return the unit to your
nearest authorised service centre.

Never point the nozzle at yourself or anyone else.

Never exceed the pressure rating of any component
installed in the System.

Before every use check all hoses for signs of wear,
leaks or loose fittings. Tighten all fluid connections
regularly and replace weak or damaged hoses.

Before attempting any repairs or maintenance of this
product firstly disconnect the air supply from the oil
pump, then release the oil line pressure by squeezing
the lever on your oil control gun.

ASSEMBLY

Use Teflon tape (or suitable thread sealant ) when
connecting the oil control gun to an oil hose.

OUTLET NOZZLE OPERATION

When fluid flows through the gun the outlet nozzle will
automatically open. When the fluid flow stops the outlet
nozzle will automatically shut.

HANDLE OPERATION

To latch the handle, squeeze the lever, push the button
and then release lever.

To release the latch in manual mode simply squeeze and
release lever.

READ THIS INFORMATION
CAREFULLY BEFORE USE.

CAUTION

Before carrying out any maintenance disconnect the
air supply to the pump and release the fluid pressure
in the system by pressing the lever on the control gun.

Inspect your oil control gun daily for any signs of damage.
Replace any damaged parts or components as required.

CAUTION

Include s m ode ls

HG20F-01
HG20R-01
HG20R-02

HG616 Issue 10 © 2017 2

CONTROL HANDLE DISASSEMBLY

Use a clean bench to carry out maintenance.

A) Remove the oil hose from the control gun inlet swivel
(10).

B) Unscrew and remove swivel (10) washer and o’ring
from the control gun inlet. (Clean or replace the swivel
strainer and o’ring if required).

The swivel is under spring tension

C) Remove valve spring (9), seal/valve body assembly (8).
and plunger (7).

D) Remove the screw (15), then unclip and remove the
trigger guard (16).

LEVER and VALVE REMOVAL

A) Using a 2.5mm allen key, remove the 2 handle screw
(2).

B) Remove lever (11), ease downwards.

C) Remove the washer (5), “O”Ring (3), then push the
valve cam (4) from the gun body (6), and remove “O”Ring
(3).

Note: If the plunger has not been removed the cam will not
release from the body.

PARTS DIAGRAM

CONTROL HANDLE REASSEMBLY

A) Clean and inspect all parts. Replace any suspect,
worn or damaged components.

Note: Lightly lubricate the valve cam before assembly.

B) Place “O”Ring (3) onto valve cam (4).

Note: The cut out section in the middle of the valve cam
(4) must face the inlet swivel (10).

C) Replace the valve cam (4) into the body (6). Note the
orientation shown on the assembly drawing. Fit the
second “O”Ring (3) and washer (5).

D) Slide lever assembly (11) into position and replace the
two Allen screws (2). (Use Loctite or similar sealant).

E) Replace plunger (7).

Note: The end hole in the plunger must face the gun
outlet.

F) Replace the seal/valve body assembly (8), and
spring (9) and replace into the gun body (6).

Note: Install the spring, small end first.

G) Re-fit the trigger guard (16) and replace screw (15)

H) Replace washer, o’ring on to the swivel assembly (10),
and screw firmly into place (Use Loctite or similar
sealant).

Note: After assembly ensure the handle latch is operating
correctly.

CAUTION

2

6

10

5

3

1

14

9

12

15

11

8

7

4

13

16

3

15