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WARNING

: The high pressure stream of water that

this equipment produces can pierce skin and its
underlying tissues, leading to serious injury and
possible amputation.
• NEVER repair high pressure hose. Replace it.
• Replacement hose rating MUST exceed maximum

pressure rating of unit.

Check for cuts, leaks, abrasions or bulging of cover,
damage or movement of couplings. If any of these
conditions exist, replace the hose immediately.

Check Detergent Siphoning Tube

Examine the filter on the detergent tube and clean if
clogged. The tube should fit tightly on the barbed
fitting. Examine the tube for leaks or tears. Replace
the filter or tube if either is damaged.

Check Gun and Adjustable Nozzle

Extension

Examine the hose connection to the spray gun and
make sure it is secure. Test the trigger by pressing it
and making sure it “springs back” into place when
you release it. Put the trigger lock in the ON position
and test the trigger. You should not be able to press
the trigger.

Check In-Line Filter

Refer to Figure 3 and service the in-line filter if it
becomes clogged, as follows:

1. Detach spray gun and nozzle extension from

high pressure hose. Detach nozzle extension
from spray gun and remove o-ring and screen
from nozzle extension. Flush screen, spray gun,
and nozzle extension with clean water to clear
debris.

2. If screen is damaged, o-ring kit contains a

replacement in-line filter screen and o-ring. If
undamaged, reuse screen.

3. Place in-line filter screen into threaded end of

nozzle extension. Direction does not matter.
Push screen in with eraser end of pencil until it
rests flat at bottom of opening. Take care to not
bend screen.

4. Place o-ring into threaded end of nozzle

extension. Push o-ring snugly against in-line
filter screen.

5. Assemble nozzle extension to spray gun, as

described earlier in this manual.

Nozzle Maintenance

A pulsing sensation felt while squeezing the spray
gun trigger may be caused by excessive pump
pressure. The principal cause of excessive pump
pressure is a orifice clogged or restricted with
foreign materials, such as dirt, etc. To correct the
problem, immediately clean the orifice using the
tools included with your pressure washer and follow
these instructions:
1. Shut off engine and turn off water supply.
2. Detach nozzle extension from spray gun. Twist

nozzle clockwise to stream position. Using 2mm
(5/64) allen wrench, remove orifice from end of
nozzle extension.

3. Remove in-line filter from other end of nozzle

extension.

4. Use wire (or small paper clip) to free any foreign

material clogging or restricting orifice.

5. Using garden hose, remove additional debris by

back flushing water through nozzle extension.
Back flush between 30 to 60 seconds. Turn
adjustable nozzle extension to stream spray and
move nozzle from low to high while flushing.

6. Reinstall orifice and in-line filter into nozzle

extension. Do Not overtighten orifice with allen
wrench.

7. Reconnect nozzle extension to spray gun.
8. Reconnect water supply, turn on water, and start

engine.

9. Test pressure washer by operating with nozzle

in high and low positions.

12

Nozzle Extension

Filter Screen

O-ring

Figure 3

Summary of Contents for MAC 3.5PWA

Page 1: ...91GS Revision 1 2 20 2006 Upright Pressure Washer Operator s Manual Questions Help is just a moment away Call your technical helpline at 0845 300 2577 Before using this product read this manual and fo...

Page 2: ...d herein and marked on the product This manual contains information for a pressure washer that operates at 124 BAR at a flow rate of 450 liters per hour This high quality residential system features 1...

Page 3: ...engine Engage trigger lock when not in use When starting engine pull cord slowly until resistance is felt and then pull rapidly to avoid kickback After each starting attempt where engine fails to run...

Page 4: ...at may be caught in the starter or other rotating parts Tie up long hair and remove jewelry CAUTION Excessively high or low operating speeds increase risk of injury and damage to pressure washer DO NO...

Page 5: ...ris out of intake air H Recoil Starter Used for starting the engine manually Adjustable Nozzle not shown Always attached to nozzle extension Adjustable nozzle allows you to adjust spray pressure and s...

Page 6: ...ng Pressure Washer for Use If you have any problems with the assembly of your pressure washer or if parts are missing or damaged call the technical helpline at 0845 300 2577 If calling for assistance...

Page 7: ...hand NOTE Remove and discard all pump shipping caps before attaching hoses 2 Attach other end of high pressure hose to high pressure outlet on pump Tighten by hand 3 Before connecting garden hose to w...

Page 8: ...from entering a confined area through windows doors ventilation intakes or other openings Do not operate pressure washer inside any building or enclosure Ensure exhaust gas is kept away from any windo...

Page 9: ...occur on contact Exhaust heat gases can ignite combustibles structures or damage petrol tank causing a fire Do not touch hot surfaces and avoid hot exhaust gases Allow equipment to cool before touchin...

Page 10: ...ce filter end of detergent siphoning tube into detergent container CAUTION Keep the detergent siphoning tube from coming in contact with the hot muffler When inserting the filter into a detergent solu...

Page 11: ...f you run the engine on your pressure washer for 3 5 minutes without pressing the trigger on the spray gun circulating water in the pump can reach temperatures above 52 C 125 F The system engages to c...

Page 12: ...n into threaded end of nozzle extension Direction does not matter Push screen in with eraser end of pencil until it rests flat at bottom of opening Take care to not bend screen 4 Place o ring into thr...

Page 13: ...peated skin contact with used motor oil Used motor oil has been shown to cause skin cancer in certain laboratory animals Thoroughly wash exposed areas with soap and water KEEP OUT OF REACH OF CHILDREN...

Page 14: ...k 5 Check and clean inlet hose strainer 6 Provide cooler water supply 7 Clear blocks in outlet hose 8 Replace gun 9 Clean orifice 10 Contact local service facility Detergent fails to mix with spray 1...

Page 15: ...ithin the relevant time period we will either replace all defective parts or at our discretion replace the unit free of charge with the same item or items of a greater value and or specification 3 Thi...

Page 16: ...MacAllister Power Tools 1 Hampshire Corporate Park Chandlers Ford Eastleigh Hants SO53 3YZ UK 0845 300 2577...

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