USMS Delta Wedge

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Maintenance Work in the Area About the Barrier

Confirm that the Barrier operates smoothly during the raise and lower cycle. Adjust speeds as desired.
Check all control functions for complete operation of all features.
Select Barrier UP or DOWN position as desired from the control panel
Turn control panel key switch to OFF position and remove key
Turn system power OFF at the disconnect on the hydraulic power (HPU). Padlock teh disconnect with your personal lock.
If Barrier is in the UP position, securely block Barrier to prevent falling. Note: Lifting eyes secured in the tapped holes provided in the top plates can be used for chaining the Barrier in the UP position.
Proceed with maintenance.
When all work is finished, remove padlock and turn HPU disconnect ON. Close any valves opened in the bleed down procedure. Return panel key to the control panel.
Proceed with maintenance. Minimize any exposure to working under the Barrier by using when ever possible tools with handle extensions.
Remove Barrier top plates, check that the hydraulic cylinders are not leaking internally (see Hydraulic Trouble Shooting section for details). Replace cylinder seals or cylinder as necessary.
Check cylinder clevis pins for wear, replace as necessary.
Examine the foundation frame for debris buildup, check drain lines and sump wells for drainage. Clean debris.
Tighten or replace any loose top plate bolts. Drill and tap to next size or use inserts if threads are stripped.
Check condition of the Barrier paint surface and record if touch up of paint required. Apply new reflective tape as necessary.
Check hydraulic interconnect lines for kinks, contact wear or bulging. Replace or protect hoses as required.
Replace the oil filter. If cycle rate is greater than 100 cycles per day, or the location is in a high dust environment, recommend replace filter monthly.
Check the accumulator pressure while the system is at zero pressure using Delta Charging Kit 2469-31 or equal. If tool is not available, observe the value that the pressure gage jumps to when power is again turned on. (See Hydraulic Section for details.) Log value and pressure setting on Log sheet provided.
Test motor starter overloads by pressing the test button. Replace if necessary or press reset. Auto/Manual switch should be in the Manual position.
Bleed down the system:
If system is equipped with the optional auxiliary emergency fast operate system, release the auxiliary EFO valve override pin by twisting and pulling to the out position.
Release set screw (or lock nut) on the system bleed down valve. Turn (anticlockwise) the handle on the valve slightly until hissing sound is heard. Continue to open slowly until pressure on gage reads zero.
For added safety, leave valve open while performing maintenance.
Thoroughly clean the HPU, removing dust and spilled oil. Remove any rust build up on components. Touch up paint where necessary.
Add clean, oil to the top of the site glass.
Remove Barrier top plates and check for debris build up in the bottom of the foundation frame. Check for indications of oil leaks around the cylinders and Barrier header fittings. Tighten fittings and clean debris as necessary.
Check the tightness of each of the sixteen hardened steel cap screws holding the four bearing blocks. Anti-seize compound has been used on the bolts, reapply if you remove the bolts. The proper torque value is 45 foot-lbs [60 N-M]. Check for sand and debris about the bearings and shafts and clean if necessary. Inspect and lubricate all bronze style bearings and pins. Graphite/fiberglass bearings should be inspected for any damage and replaced as necessary, lubrication of these style bearings is optional. Reinstall top plates; check all top plate bolts for tightness. Note any tendencies for the top plate bolts to loosen.
Check the operation of the Barrier heaters if so equipped. They should get warm in approximately one minute after energization.
Test motor starter overloads by pressing the test button. Replace if necessary or press reset. Auto/Manual switch should be in the Manual position.
Check the pressure relief valve by depressing the starter armature and allowing unit to run to the relief pressure value of 2200 psig [152 bar]. Adjust as necessary.
Clean dust and debris from around HPU tank and hydraulic lines.
Check all control functions for complete operation of all features.

Signature Acknowledgement

ELECTRONIC SIGNATURE ACKNOWLEDGE, I AGREE THAT MY ELECTRONIC SIGNATURE IS A LEGALLY BINDING EQUIVALENT TO MY HANDWRITTEN SIGNATURE. WHENEVER I EXECUTE AN ELECTRONIC SIGNATURE, IT HAS THE SAME VALIDITY AND MEANING AS MY HANDWRITTEN SIGNATURE. I WILL NOT AT ANY TIME IN THE FUTURE, REPUDIATE THE MEANING OF MY ELECTRONIC SIGNATURE OR CLAIM THAT MY ELECTRONIC SIGNATURE IS NOT LEGALLY BINDING.
End-User Representative
NASATKA Representative