Macnaught HG20R, HG20F Instruction Manual

HG 20R(Rigid) and HG20F (Flexible) OIL CONTROL GUNS

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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 fulfill all your fluid handling and greasing
needs requirements.

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.

IMPORT ANT INFORMA TION

READ THIS INFORMATION
CAREFULL Y BEFORE USE.

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 .

CAUTION

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.

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OUTLET NOZZLE OPERA TION

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.

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

INSTRUCTION MANUAL

HG616

0206

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.

CONTROL HANDLE DISASSEMBLY

Use a clean bench to carry out maintenance.
A) Remove the oil hose from the control gun inlet swivel

(21).

B) Unscrew and remove swivel (21) washer (19) and o’ring

(20) from the control gun inlet. (Clean or replace the
swivel strainer and o’ring if required).

Caution the swivel is under spring tension

D) Remove the screw (23), then unclip and remove the

trigger guard (22).

C) Remove valve spring (18), seal/valve body assembly (17).

and plunger (15).

LEVER and VALVE REMOVAL

A) Using a 2.5mm allen key, remove the 2 handle screws
(10).

B) Remove lever (11), ease downwards.

C) Remove the washer (7), “O”Ring (8), then push the valve
cam (9) from the gun body (6), and remove “O”Ring (8).

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 (8) onto valve cam (9).

Note: The cutout section in the middle of the valve cam (9)
must face the inlet swivel (21).

C) Replace the valve cam (9) into the body (6). Note the
orientation shown on the assembly drawing. Fit the
second “O”Ring (8) and washer (7).

D) Slide lever assembly (11) into position and replace the two
allen screws (10). (Use Loctite or similar sealant).

E) Replace plunger (15).
Note: The end hole in the plunger must face the gun outlet.
F) Replace the seal/valve body assembly (17), and spring

(18) and replace into the gun body (6).
Note: Install the spring, small end first.

H) Replace washer (19), o’ring (20) on to the swivel assembly
(21), and screw firmly into place (Use Loctite or similar
sealant).

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

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G) Re-fit the trigger guard (22) and replace screw (23).

P ARTS DIAGRAM

HGFNZ

1

2

3

4

5

6

7

8

9

10

11

8

10

12

13

14

15

18

19

20

21

22

23

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

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