170
OMAHA STANDARD
CAUTUION! DO NOT USE SAFETY PROP TO SUPPORT A LOADED BODY
1) Check reservoir filter screen and breather cap. Clean if dirty
2) Replace pump if hoist performance has degraded over time
3. HOIST DELAYS BEFORE LIFTING:
A. Air trapped in system:
1) Cycle hoist to full stroke 7-8 times to remove all air from cylinder
2) Change hydraulic oil to non-foaming, non detergent type
B. Pump sucking air into system:
Note: Always “power down” a double acting hoist to prevent sucking air into the system
and displacing oil from reservoir
WARNING! PROP OR BRACE BODY BEFORE SERVICING HOIST OR
WORKING UNDER BODY!
CAUTION! DO NOT USE SAFETY PROP TO SUPPORT A LOADED BODY
1) Check reservoir oil level. Add oil if level is lower, than 2” from top of reservoir when
hoist is fully closed.
2) Check fittings and hoses for loose connections. Re-tighten fitting and hoses or replace
if necessary
4. HOIST WILL NOT FIT LOAD TO TOP OF STROKE:
1) Check reservoir oil level. Add oil if level is lower than 2” from top of reservoir when
hoist is fully closed.
5. LOAD CREEPS DOWN IN A HOLD POSITION:
A. Oil leaking past valve spool:
1) Valve must center. Check valve for contamination. Clean or replace valve if
necessary
2) Defective or worn valve. Replace
B. External Hydraulic system oil Leak:
1) Inspect hydraulic fitting, hoses, and cylinder for oil leakage. Re-tighten fittings
and hoses or replace fitting, hoses, and/or cylinder if necessary.
C. Oil leaking past cylinder seals:
1) Rebuild or replace cylinder. (see cylinder rebuild procedure)
6. HOIST WILL NOT LOWER
A. Valve assembly not actuating:
1) Valve must move full stroke when engaged. Check valve for contamination.
Clean or replace valve.
2) Defective valve. Replace
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