791-6021
4
rev. 12/06/13
WARRANTY
Please contact your local NAPA Auto Parts Store for details on warranty.
OPERATING MANUAL & PARTS LIST FOR 791-6021
TROUBLESHOOTING
PROBLEM
POSSIBLE CAUSES
ACTION
Crane will not lift load.
Release valve not tightly closed
Overload condition.
Air trapped in hydraulic system.
Hydraulic valves not operating
properly.
Close release valve firmly.
Use jack with proper capacity.
Purge air from system by following steps "a"
through "d" in the "ASSEMBLY INSTRUCTIONS"
section of the manual.
Contact your dealer.
Crane will lift but lowers load
slowly.
Release valve not tightly closed
Hydraulic valve not tightly closed
Close release valve firmly.
Contact your dealer.
Crane will not lower after
load has been removed.
Jack's reservoir has too much
fluid.
Place jack in its upright position. Retract the
ram. Remove the reservoir fill plug. Allow oil
to drain out of fill plug hole until oil level is at
bottom level of hole. Reinstall fill plug.
Poor lift performance or will
not lift maximum height.
Hydraulic fluid low.
Air trapped in hydraulic system.
Place jack in its upright position.
Retract the ram. Remove the reservoir fill plug.
Add only high quality jack oil up to the bottom
level of the hole.
Reinstall fill plug. Purge air from system
according to steps "a" through "d" in the
"ASSEMBLY INSTRUCTIONS" section of this
manual.
Purge air from the system. See steps "a"
through "d" in the "ASSEMBLY INSTRUCTIONS"
section of this manual.
PREVENTATIVE MAINTENANCE
This is the safety alert symbol used for the PREVENTATIVE MAINTENANCE section of this manual to alert you to potential personal
injury hazards. Obey all instructions to avoid possible injury or death.
1. Always store the crane in a well protected area where it will not be exposed to inclement weather, corrosive vapors, abrasive dust,
or any other harmful elements. The jack must be cleaned of water, snow, sand or grit before using.
2. Lubricate the wheels, casters, and all pivot points on the crane according to an acceptable shop maintenance schedule.
Maintenance intervals are dependant on time and usage.
3. Every crane owner is responsible for keeping the crane labels clean and readable. Use a mild soap solution to wash external
surfaces of the crane but not any moving hydraulic components. Contact NAPA for a replacement label if your crane's label is not
readable.
4. Inspect the crane before each use. Do not use the crane if any component is cracked, broken or bent. Do not use the crane if it
has loose or missing hardware or components, or is modified in any way. Take corrective action before using the crane again.
5. It should not be necessary to refill or top off the crane’s jack reservoir with hydraulic fluid unless there is an external leak. An
external leak requires immediate repair which must be performed in a dirt-free environment by qualified hydraulic repair
personnel who are familiar with this equipment. Authorized service centers are recommended. IMPORTANT: In order to prevent seal dam-
age and jack failure, never use alcohol, hydraulic brake fluid or transmission oil in the jack. Use NAPA hydraulic Jack Oil #765-1541.
For a complete list of authorized hydraulic repair centers please visit
www.toolwarrantyrepair.com
.
