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Napa 791-6021 - User Manual

Napa 791-6021
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791-6021 1 rev. 12/06/13
MODEL # 791-6021
1-1/2 TON CapaCiTy
CRaNE
Read, study, understand and follow all instructions before
operating this device. • Inspect crane before each use. Do
not use if damaged, altered, modied, in poor condition,
leaking hydraulic uid, or unstable due to loose or missing
hardware or parts. Make corrections before using. Never
get under a load being lifted or suspended. Wear eye
protection that meets ANSI Z87.1 and OSHA standards.
• Use only on a hard level surface. • Do not raise the boom
if the crane is equipped with a foldable or storable leg
feature and the legs are in the upright position. Legs must
be secured in the upright position when not used. Use
only slings or chains with a rated capacity greater than
the weight of the load being lifted. Do not exceed rated
capacity. Do not lift or move a load that has a center of
gravity extending beyond the front wheels. Do not allow
load to swing or drop violently while raising, lowering or
moving. • Before moving, lower load to the lowest possible
point. No alterations shall be made to this product, and
do not use any unapproved attachments. This product
contains one or more chemicals known to the State of
California to cause cancer and birth defects or other
reproductive harm. Wash hands thoroughly after handling.
Failure to heed these warnings may result in serious or
fatal personal injury and/or property damage.
WARNING
BEFORE USING THIS DEVICE, READ THIS
MANUAL COMPLETELY AND THOROUGHLY,
UNDERSTAND ITS OPERATING
PROCEDURES, SAFETY WARNINGS AND
MAINTENANCE REQUIREMENTS.
It is the responsibility of the device owner to make sure all personnel
read this manual prior to using the device. It is also the responsibility
of the device owner to keep this manual intact and in a convenient
location for all to see and read. If the manual or product labels are lost
or not legible, contact NAPA for replacements. If the operator is not
uent in English, the product and safety instructions shall be read to
and discussed with the operator in the operator's native language by
the purchaser/owner or his designee, making sure that the operator
comprehends its contents.
Boom Capacity Pos. 1 @ 750 Lbs. .... Pos. 2 @ 1,500 Lbs. ....Pos. 3 @ 2,250 Lbs. ...... Pos. 4 @ 3,000 Lbs.
Max. Boom Ht. 96.5" ........................... 90.5" ............................84.5" .............................. 78.5"
Min. Boom Ht. 0" ................................. 0" ................................ 5.5" .............................. 11.75"
Boom Ext. From End
to Ram 48" ............................. 41.5" ............................. 34" .................................27"
Base Dimensions – Open
Width Back ...................................................................................................................................................................... 34"
Width Front .................................................................................................................................................................. 35.5"
Length .......................................................................................................................................................................... 69.5"
Base Dimensions – Folded
Width Back ...................................................................................................................................................................... 34"
Width Front ..................................................................................................................................................................... 24"
Depth ........................................................................................................................................................................... 21.5"
Power Unit............................................................................................................................... 8 Ton Heavy Duty Fast Rise
Shipping Weight......................................................................................................................................................216 Lbs.
(Shipped in 2 boxes)
SPECIFICATIONS

Questions and Answers

  • A
    Amy LoganAug 4, 2025
    What to do if my Napa 791-6021 crane will not lift the load?
    • I
      Ian WalkerAug 4, 2025
      If your Napa Construction Equipment crane won't lift the load, make sure the release valve is firmly closed. An overload condition could also be the cause, so ensure you're using a jack with the correct capacity. Trapped air in the hydraulic system can also prevent lifting; follow steps "a" through "d" in the "ASSEMBLY INSTRUCTIONS" section of the manual to purge the air. If these steps don't resolve the issue, the hydraulic valves may not be operating properly, and you should contact your dealer.
  • P
    Pamela HodgesAug 14, 2025
    Why is my Napa 791-6021 crane having poor lift performance?
    • S
      Stephanie BaileyAug 14, 2025
      If your Napa Construction Equipment crane exhibits poor lift performance or fails to reach maximum height, the hydraulic fluid level might be low. To resolve this, place the jack upright, retract the ram, remove the reservoir fill plug, and add high-quality jack oil until it reaches the bottom level of the hole. Then, reinstall the fill plug. Alternatively, air trapped in the hydraulic system could be the cause. Purge the air from the system by following steps "a" through "d" in the "ASSEMBLY INSTRUCTIONS" section of this manual.
  • D
    Dawn MartinAug 25, 2025
    Why does my Napa 791-6021 Construction Equipment crane lift but lowers load slowly?
    • K
      Katelyn MartinezAug 25, 2025
      If your Napa Construction Equipment crane lifts but lowers the load slowly, it could be due to a release valve that isn't tightly closed. Ensure the release valve is firmly closed. Another possibility is a hydraulic valve that is not tightly closed, in which case you should contact your dealer.

Summary

Pre-Operation Instructions

General Safety Warnings

Crucial warnings about operating hazards, including inspection, personal protection, and load handling.

Nature of Hazardous Situations

Methods to Avoid Hazardous Situations

Provides essential steps to prevent accidents, including inspections, proper use, and load handling.

Consequences of Hazardous Situations

Explains that failure to comply with instructions can lead to serious or fatal personal injury and property damage.

Setup Instructions

Purging Air from Hydraulic System

Procedure to remove trapped air from the hydraulic system to ensure proper jack operation.

Operating Instructions

Crane Operation Procedures

Steps for safe lifting, including load weight determination, boom extension, and securing the load.

Preventative Maintenance

Troubleshooting

Addresses common problems like the crane not lifting, slow lowering, or poor lift performance.

Warranty Information

Parts Identification

Hydraulic Ram Assembly (85 mm Ø Tank)

Detailed breakdown and part numbers for the 85mm diameter hydraulic ram.

Hydraulic Ram Assembly (75 mm Ø Tank)

Detailed breakdown and part numbers for the 75mm diameter hydraulic ram.

Napa 791-6021 Specifications

General IconGeneral
BrandNapa
Model791-6021
CategoryConstruction Equipment
LanguageEnglish