12 ► HP210 User Manual
ENGINE MAINTENANCE SCHEDULE
Follow the maintenance instructions provided in the engine 
“Operating & Maintenance Instructions” manual.
HYDRAULIC SYSTEM MAINTENANCE
•  Check hydraulic uid level daily and ll if needed.
•  Check hydraulic lines and ttings daily for leaks, kinks 
or damage. Do not use your hand to perform this 
check.
•  Remove condensed moisture from the hydraulic uid. 
1.  Set the ow selector to a 5 GPM/20 LPM circuit 
ow.
2.  Start the engine and pump the uid, out of the 
pressure port, into a 5 gal. container.
3.  When hydraulic tank is empty, turn the Ignition 
Switch to the “Off” position.
4.  Let the water settle to the bottom of the 
container.
5.  Pour the hydraulic uid back into the tank, being 
careful to not disturb the water sitting at the 
bottom of the container.
•  Change the hydraulic lter every 200 hours of 
operation. Change more often if used in cold, moist or 
dusty conditions.
•  Check oil cooler.  Remove debris with air pressure.
BATTERY
•  Do not charge the battery with an automotive battery 
charger. Charging at higher than 2 amps will damage 
the battery.
•  If the engine stalls during operation, set the Ignition 
Switch to the “OFF” position to preserve battery charge.
STORAGE
•  Clean the unit thoroughly. Do not pressure wash.
•  Always store the unit in a clean and dry location.
•  If storing for over 30 days, add an additive to the fuel 
tank to prevent the fuel from gumming. Run the engine 
to circulate the additive.
•  Replace the crankcase oil.
GENERAL
Tests should be performed periodically to ensure HP210 is 
operating at maximum efciency. STANLEY Circuit Tester 
(part number 04182) can be used to isolate problems in 
both the engine and hydraulic system.
TESTING THE HYDRAULIC CIRCUIT
Test to ensure the hydraulic pump is supplying the correct 
ow and pressure, and that the system relief valve is 
operating properly. Before testing, make sure the engine is 
warm and operating smoothly. 
1.  Turn the Flow Switch to the “FLOW OFF” position. 
2.  Set the Flow Selector Knob to the ow you would like 
to test.
3.  Connect the STANLEY Circuit Tester to the tool hoses.
4.  Fully open the tester restrictor valve (counterclockwise).
5.  Start the engine.
6.  The test ow gauge should read +/- 1 GPM of the 
selected ow.
7.  Slowly turn the restrictor valve clockwise while 
watching the pressure gauge. The ow rate should not 
change as the pressure reaches 2100-2200 psi/148-
155 bar.
8.  At 2100-2200 psi/148-155 bar, the relief valve should 
begin to open. The ow rate should start to drop 
because the relief valve is allowing uid to bypass to 
the hydraulic uid tank. The relief valve is preset at the 
factory. If it does not open within the above range, the 
relief valve must be reset as follows: 
a. The relief valve is located on the right side of the 
unit, behind the dash panel (10, page 16). Use a 
wrench to loosen the nut on the relief valve.
b. Use an Allen wrench to adjust the relief valve. 
Turn clockwise to raise the opening pressure, and 
counterclockwise to reduce the opening pressure.
c.  Tighten the nut and repeat the test.
MAINTENANCE & TESTING