Routine Maintenance Overview Checklist
318 Load Unit Maintenance
83
7. Briefly turn the Lift Control to the lift crosshead position to pressurize the
lift cylinders. Then return it to the stop crosshead position.
8. Shut the bleed port when bubble-free fluid begins oozing out. If necessary,
again pressurize the lift cylinders to force all the air out.
9. Repeat Step 6 through Step 8 to bleed the air out of the other lift cylinder.
Note If fluid continues to leak out of a shut bleed port, turn off hydraulic
pressure to the load unit. Let the pressure in the lift cylinders return to
zero. Then replace both bleed port screws (MTS par number
010-037-601).
10. Turn on high hydraulic pressure. If pressure was reduced at the hydraulic
power unit, restore full pressure.
11. Briefly turn the Lift Control to the lift crosshead position to pressurize the
lift cylinders. Then return it to the stop crosshead position.
12. Unlock the crosshead and exercise the crosshead. Then return to the stop
crosshead position. Raise and lower the crosshead to check for smooth
operation. Lock the crosshead.
13. If the crosshead does not move smoothly, go back to Step 4 and continue
from there.
318 Load Unit: Adjust the Hydraulic Locks
Hydraulic locks might need adjustment if the crosshead still moves jerkily after
bleeding the lift cylinders. Adjustment might also be needed if the crosshead
slips under full load.
If adjusting the hydraulic locks does not fix these problems, call MTS.
1. Turn on electrical power at the controller. Do not turn on hydraulic pressure
yet.
2. If the crosshead is already at a comfortable working level with no specimen
installed, proceed to Step 3.
If not, position the crosshead for a comfortable working level. Proceed as
follows:
A. Reset any active interlocks at the test controller.
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