Mighty-Mite Steel 1/4-Ton Gantry Crane
12′ Span, 5′ 3″ – 7′ 11″ Height

Model 5-08M-12

Parts List

Note: Optional flat and v-groove casters are also available for this crane. Learn more on the Optional Accessories tab of this page.

Print / download a copy of the 5-08M-12 parts list  (PDF). The file contains the parts list as well as parts location diagrams (shown on the next tab) for this model.

Model 5-08M-12

Parts Location Diagrams

Mighty-Mite Crane Parts Location (Without Casters)

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Mighty-Mite I-Beam Parts Location Diagram

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Print / download a copy of both parts location diagrams (PDF). The file contains the parts list (shown on the previous tab) as well as parts location diagrams for this model.

Model 5-08M-12

Optional Accessories

Optional Geared Trolley

These cranes are mounted on protective rubber pads. Optional 6″ flat-tread and v-groove track-mounted casters are also available. When requesting a quote, simply state your preference in the “obstructions or special requirements” field of the RFQ form (step 3, question 2).

Additional optional accessories include manual and electric trolleys, hoists, jack kits (for frequent crane height adjustments), and festooning kits to keep hoist and trolley cords up and out of the way.

Model 5-08M-12

Assembly and Disassembly Instructions

Cautions

1. Read and understand instructions before using this crane.
2. Pay attention to the equipment used with this crane such as hoists and trolleys.
3. Inspect gantry thoroughly before using. See the Gantry Operating, Adjustment, and Inspection Instructions (Form 379) for damaged or missing parts.
4. Do not lift more than rated capacity.
5. Center hoist over the load.
6. Do not allow the load to swing or roll against any supporting members.
7. When moving the gantry under load, push on the gantry, not the load. Be certain that the rolling surface is hard, level, clean, and smooth.
8. Do not move the gantry over 50 feet per minute (1/2 m.p.h.).
9. Not to be used for lifting or supporting humans.

Step 1: Assemble I-Beam Hardware Components

A. Place I-Beam (1) on a pair of suitable supports in an upright position so the stencils are right side up.
B. Slide one pair of I-Beam Brackets (2) onto each end of the I-Beam (1). Make sure the welded tabs on the brackets face away from each other.
C. Slide second pair of I-Beam Brackets (2) onto each end of the I-Beam (1). Make sure the welded tabs on the brackets face away from each other.
D. Attach an I-Beam Safety Key Ring (8) to each end of the I-Beam (1) through the 3/8″ holes.
E. At each end of the crane separate the Main Leg Bracket and the Brace Leg Bracket with a Spacer Bar (3). Remove the nut from each bracket, place the spacer bar over the set screw and replace the nut. The nut does not need to be tightened yet.
F. Connect your trolley and hoist, if you have them, to the I-beam (1) as per their instructions. Secure Trolley to I-Beam (1) until erection of crane is complete.
G. Connect a pair of Trolley Stop Angles (4) to each end of the I-Beam (1) with a pair of Bolts (5), Nuts (6) and Lockwashers (7). Be sure that the flat face of the trolley stop faces towards the center of the I-Beam.

Step 2: Assemble Main Legs and Brace Legs to the I-Beam

A. Using the Main Leg Support Pin (13), attach the upper end of each of the four Upper Main Legs (9) to each pair of outer I-Beam Brackets (2). Make sure the welded tabs at the bottom of each Upper Main Leg (9) point towards the center of the I-Beam (1). Use a Safety Key Ring (8) to secure each Main Leg Support Pin (13).
B. Using the Brace Leg Support Pin (14), attach the upper end of each of the four Brace Legs (11) to each pair of inner IBeam Brackets (2). Be sure the Brace Leg (11) is aligned so the miter cut ends will be parallel to the ground when the gantry is erected. Use a Safety Key Ring (8) to secure each Brace Leg Support Pin (14).
C. Extend the Lower Main Leg (10) from the Upper Main Leg (9) to the desired position. Make sure all four legs are adjusted equally. Use a Load Pin (15) and a Safety Key Ring (8) to secure the Upper and Lower Main Legs together. In the hole below the Load Pin (15) put another Load Pin (15) to act as a safety stop. Secure this pin with a Safety Key Ring (8).
D. Loosen the nut on the set screw on each of the eight brackets (2). Tighten the set screw with an Allen wrench until the bracket fingers rest firmly against the underside of the I-Beam flange and the set screw point bites into the I-Beam (1). Do not over-tighten the set screws so the bracket rests at a severe angle, this will hinder the construction on the crane and interfere with proper operation. Tighten each nut back down so as to lock the set screw in place.
E. Place the I-Beam Stabilizer (22) flat against the underside of the I-Beam (1) (between the Main Legs). Place a Clip (25) (teeth down) on the top of the flange. Secure the Clip (25) and I-Beam Stabilizer (22) to the I-Beam (1) with a pair of Bolts (24), Nuts (23) and Lockwashers (26). Adjust bolt spacing as needed. Repeat on other side.

Step 3: Assemble Caster Frames and Erect Crane

A. Optional if you have casters for your gantry: To each Caster Frame (12) attach two Swivel Casters (18). Use four Bolts (19), four Nuts (20) and four Lockwashers (21) to attach each Caster.
B. Using a lifting device (Such as a forklift, overhead hoist or tripod) carefully raise the I-Beam (1) so the Lower Main Legs (10) are off the ground.
C. Use a Caster Frame Pin (17) to attach the Caster Frame (12) to the two Lower Main Legs (10) at each end of the crane. Secure the Caster Frame Pin (17) with a Safety Key Ring (8).
D. Gently set the crane down, making sure all four casters are resting evenly on the floor.

Print / download a PDF (187 KB) of the detailed, step-by-step Mighty-Mite Assembly Instructions (Form MITE). The file includes the parts list and parts location diagram.

Model 5-08M-12

Inspection Checklist (Form 504)

Instructions include:

• What to check for.
• How often to check.
• Frequent Inspection Checklist.
• Periodic Inspection Checklist.

View detailed Gantry Crane Inspection Checklist (Form 504).

Print / download a PDF copy of the checklist.

If you have questions or need assistance, please contact us.

Disclaimer

Please note this checklist was derived from company proprietary materials and (3) source documents including ANSI B30.17, CMAA Specification #74 Revised 1987, and OSHA 1910.179. As excerpts, the short-form Wallace documents are intended to serve as general guidelines and are not to be considered the sole source when performing routine maintenance and inspection tasks.

Model 5-08M-12

Operating, Adjustment, and

Inspection Instructions (Form 379)

Instructions include:

• Assembly and Safety Instructions
  • Daily inspection
  • Positioning of Crane to Handle Loads
  • Positioning of Casters
• Adjustment Instructions
  • Height Adjustment Procedure
  • Caster Frame Adjustment Procedure
  • Cantilever Configuration / Adjustment
• Wallace Built-In Safety Features
• Caution Areas
• Tri-Adjustable Visual Checkpoints
• General Safety Instructions for Crane Adjustments
• Methods of Supporting the Crane for Assembly

View detailed Mighty-Mite Operating, Adjustment, and Inspection Instructions (Form 379).

Print / download a PDF copy of the instructions.

Model 5-08M-12

Cantilever Instructions

Cantilever Chart

Proper Cantilever Procedures

Required counterweight should not be supported by gantry caster frame.

Load and trolley should be able to freely traverse the I-beam through the main legs and brace legs of the gantry.

Print / download a PDF copy of these 5-08M-12 cantilever instructions.

Model 5-08M-12

Warranty and Disclaimer

Wallace product warranty and errors and omissions disclaimers can be found below.

• Product Warranty
• Errors and Omissions Disclaimer

They are also in the About section of this website.

Model 5-08M-12

Engineering Specification

This general engineering product specification is for the Wallace Steel Square-Tube Mighty-Mite (Workstation) Gantry Crane without Casters.

These include all the models on the Mighty-Mite page when they are ordered without casters. A copy of the general engineering specification for a Mighty-Mite with casters can be found below and in the Resource Center.

Gantry end frames shall be of steel round tube construction manufactured to Wallace Cranes standards, including, but not limited to the following:

• Gantry shall be adjustable in height and have main legs with 2” x 5” welded support for brace leg attachment using ½” diameter steel round bar pins.
• Gantry shall be adjustable in span so that operators may adjust the crane to an inboard braced, outboard braced, or a combination of the two or approved cantilevered configuration.
• Gantry shall have a fixed caster frame spread; and welded caster frame plates for attachment of casters.
• The steel I-beam shall be American Standard and have a design deflection of no greater than l/800th of the span.
• The telescoping legs shall be adjustable in 6” increments and also be equipped with ½” diameter steel round bar safety stops for everyday use as well as when adjusting height.
• The main legs shall have ½” diameter steel round bar load-adjusting pins for adjusting/maintaining height adjustment of crane.
• I-beam and I-beam brackets shall be painted with red gloss industrial quality paint.
• The frames, including brace legs, caster frames, and main legs shall be dip painted with red gloss industrial quality paint to protect inner and outer tubing walls.
• The model number to be provided shall be tested in accordance with Wallace specifications (A specific unit shipped is not tested; unless a Certificate of Test is ordered [additional charge applies]).
• Gantry is manufactured in accordance with our interpretation of ANSI B30.17 and U.S. OSHA, (Section 1910.179, revised January 1976), regulations at the time of manufacture.

Print / download a PDF version of the specification with casters (71 KB) or without (70 KB).