Husqvarna S427, Operator'S Manual

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Hydraulic Oil System

  WARNING!  HYDRAULIC FLUID 

can result in severe burns. Fluid in 
hydraulic system can penetrate skin and 
result in serious injury or death.
Be sure to stop the engine and relieve 
hydraulic pressure before doing any work 
on hydraulic parts.
Keep body and hands away from pin holes 
or nozzles which expel hydraulic fluid when 
under pressure. Use paper or cardboard, 
not hands, to search for leaks.
Ensure all hydraulic fluid connections are 
tight and all hydraulic hoses and lines are 
in good condition before applying pressure 
to system.
FOREIGN FLUID INJECTED INTO BODY 
can result in gangrene. Fluid must be 
surgically removed within a few hours by a 
doctor familiar with this form of injury.

Checking Hydraulic Oil Level

IMPORTANT  

ADD OIL BEFORE 

OPERATING! 

Add hydraulic oil to operating 

level before use. Do not overfill.

To check the hydraulic oil level:

1.  Park the unit on a level surface.
2.  Start the unit and run it to operating 

temperature (about 10 minutes).

3.  Cycle the hydraulic cylinder in and out 

two or three times.

4.  Shut off engine.
5.  Remove any dirt that may be around the 

cap/breather on the hydraulic reservoir.

6.  Remove cap/breather and wipe oil level 

dipstick clean.

7.  Replace cap/breather and fully tighten.
8.  Remove cap/breather and check oil 

level on dipstick. Oil should be within 
the operating range.

9.  Add hydraulic oil as necessary. Do not 

overfill.

Recommended Hydraulic Oil

Only use the following hydraulic oils:

•  ISO32 hydraulic oil 
•  Dexron® III/Mercon® automatic 

transmission fluid

•  AW hydraulic oil 10 weight
•  Pro-Mix™ AW-32 Hydraulic Oil

Hydraulic Oil 

Reservoir  

Cap/Breather

Hydraulic Oil Level 

Operating  Range