Graco 3340 User Manual

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Operation 
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7.
Move switch to ON position and set throttle to HALF 
throttle position.
8.
Trigger gun to produce a constant stream of water 
and, at the same time, pull starter rope quickly to 
start the engine. Pull and return rope until the 
engine starts. HINT: Placing one foot on the pres-
sure washer as a brace provides better leverage.
Chemical Injector Operation
1.
Follow Pressure Relief Procedure (page 6).
2.
Insert chemical filter (attached with clear tubing to 
chemical injector) into the chemical container. Insert 
brass coupler into chemical injector.
CAUTION
Do not allow pressure washer to idle for more than 
10 minutes. This causes the recirculating water to 
overheat and can seriously damage the pump. 
Turn off pressure washer if it will not be spraying at 
least every 10 minutes. If heated inlet water is used, 
reduce this time more.
Do not operate pressure washer with inlet water 
screen removed. This screen help keep abrasive 
sediment out of pump. This sediment could clog 
pump or damage cylinders. Keep screen clean.
Do not pump caustic materials which could corrode 
pump components.
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ON
OFF
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For easier starting, have one person start pres-
sure washer while another triggers gun. 
If engine is cold, before starting engine, close 
choke completely. In cool weather you might 
have to run engine for the first 10-30 seconds 
with the choke closed. In warm weather, open 
choke completely as soon as engine starts.
If engine is warm, start engine with choke 
completely open or only partially closed. When 
engine starts, open choke completely.
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OPEN
HALF
CLOSED
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