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Hydraulic power supply (HPS)
Product Support: www.instron.com
g. Very gently remove the filter element. Oil from the inner part of the filter element will drain out
and return to tank. Be careful not to shake any dirt off of the element and into the oil. Properly
dispose of the filter element.
h. Inspect the filter cavity for damage. Wipe the filter cavity with a clean towel to remove all debris.
i. Install the new filter element. Carefully slide it over the bushing at the bottom of the filter cavity.
j. Inspect the filter housing and seals for damage. Wipe them with a clean towel to remove all
debris.
k. Apply clean hydraulic oil to the threads of the filter housing (as a lubricant).
l. Install the filter housing over the filter element. Tighten the filter element by hand until you feel
resistance from the seals. Change to the 7/8 in socket and ratchet wrench and continue to
tighten the filter element until fully seated. Change to the torque wrench and tighten the filter
housing to a torque of 61 N-m (45 lbf-ft).
m. Wipe the area around the port for the relief valve with a clean towel to remove all debris.
n. Carefully install the relief valve in the port. Tighten the valve by hand until it is seated in the port
and you feel resistance from the seal. Continue to tighten the relief valve (use 1 in deep socket
and torque wrench) to a torque of 34 N-m (25 lbf-ft).
o. Install the vent plug into the top of the filter housing (use 9/16 in socket and ratchet wrench)
until snug and then back it out one full turn.
5. Purge air from the oil filter:
a. Make sure the HPS is shut down.
b. Put towels around the base of the oil filter to absorb leaking oil.
c. Start the HPS and monitor the flow of oil from the vent plug. Watch for air bubbles in the oil. Run
the HPS until there are no more air bubbles. Clean up any leaking oil.
d. Press the DISABLE FRAME button in the controlling software to shut down the HPS.
e. Tighten the vent plug (use 9/16 in socket and torque wrench) to a torque of 20 N-m (15 lbf-ft).
Clean up any leaking oil.
f. Start the HPS and let it run for approximately ten minutes. While the HPS is running watch the oil
filter and vent plug for oil leakage. If there is oil leakage, check and tighten the appropriate
component.
g. When there is no oil leakage, cycle the hydraulic cylinder through its full stroke several times to
ensure proper operation and to completely purge air from the system.
h. Press the DISABLE FRAME button in the controlling software to shut down the HPS.
6. Clean the HPS of all spilled and leaked oil. Clean the area around the fill hole and air breather
filter (3 and 2) to remove all dust, dirt and grime.
7. Remove the air breather filter from the reservoir fill hole - push down and turn counterclockwise.
8. Remove the screws from the air breather fitting (use 3 mm hex key) on the reservoir. Remove the
fitting and plastic screen from the reservoir fill hole.
9. Insert the hand pump hose into the reservoir.
10. Pump the oil out of the reservoir and into the oil container.
11. Install the air breather fitting and plastic screen into the reservoir fill hole. Secure the air breather
fitting to the reservoir with the screws that were removed in step 8.
12. Insert a clean funnel with a mesh filter into the fill hole and fill the reservoir with the recommended
hydraulic fluid. Fill the reservoir to the top of the sight gauge.
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