12 ► HP12
User Manual
ENGINE MAINTENANCE SCHEDULE
Follow the maintenance instructions provided in the engine
“Operating & Maintenance Instructions” manual.
HYDRAULIC SYSTEM MAINTENANCE
•
Check hydraulic fluid level daily and fill if needed.
•
Check hydraulic lines and fittings daily for leaks, kinks
or damage. Do not use your hand to perform this
check.
•
Remove condensed moisture from the hydraulic fluid:
1. Set the flow selector to a 8 GPM/20 LPM flow.
2. Start the engine and pump the fluid, out of the
male hose fitting, 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 fluid back into the tank, being
careful to not disturb the water sitting at the
bottom of the container.
•
Change the hydraulic filter 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.
• I
f 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 crankcase oil.
GENERAL
Tests should be performed periodically to ensure HP12 is
operating at maximum efficiency. 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
flow 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 selector switch to the “OFF” position.
2. Set the flow control to the flow 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 flow gauge should read +/- 1 GPM of the
selected flow.
7. Slowly turn the restrictor valve clockwise while
watching the pressure gauge. The flow 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 flow rate should start to drop
because the relief valve is allowing fluid to bypass to
the hydraulic fluid 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 (7, 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 test again.
MAINTENANCE & TESTING
