stellar labs 12621 User Manual (English)

Kenneth BrownAug 18, 2025

How to troubleshoot a stellar labs 12621 Construction Equipment crane that won't operate?

J
Jared LeAug 18, 2025
If your Stellar Labs Construction Equipment crane isn't operating, there are several things to check: * Ensure the parking brake is engaged. * Ensure the PTO is engaged. * Confirm there's 12V power going to the radio receiver; if not, trace back to the power source, checking for blown fuses or loose ground connections. * Verify the transmitter batteries are fully charged. * Check that the hydraulic pump is operating at its rated flow (GPMs) using a flow meter; a weak pump may require contacting Stellar Customer Service.

Brand	stellar labs
Model	12621
Category	Construction Equipment
Language	English

Brand

stellar labs

Model

12621

Chapter 1 - Operation

General Operation

Guidelines for safe and proper crane operation.

Pre-Operation Inspection

Daily checks required before operating the crane for safety.

Job Site Setup Procedures

Planning and positioning the vehicle and crane for the work area.

Radio Remote Control Functions

Explanation of buttons and toggles on the radio remote control.

Radio Remote Feedback and Boost Mode

Understanding crane capacity feedback and boost mode activation.

Radio Remote Control Features

Details on sleep mode, E-stop, battery replacement, and backup cord.

Wire Rope and Sheave Configurations

Diagrams illustrating standard and single part line rope configurations.

Personal Fall Protection

OSHA provisions and requirements for using personal fall protection equipment.

Safety Decals of Note

Identification and explanation of key safety decals found on the crane.

Body/Chassis Safety Decals

Decals on body/chassis concerning electrocution hazards and safe clearance.

Stabilizer Safety Decals

Decals on stabilizer legs warning about crush hazards and keeping clear.

Crane Compartment Safety Decals

Decals within the crane compartment covering electrocution, overload, and operator hazards.

Main Boom Safety Decals

Decals on the main boom regarding fall, free falling, misuse, and electrocution hazards.

Crane Horse Head Decals

Decals on the crane horse head warning about misuse hazards.

Valve Bank Decals

Decals on the valve bank concerning movement hazards.

Main Cylinder Decals

Decals on the main cylinder warning about overload hazards and tampering.

Chapter 2 - Maintenance

General Maintenance Guidelines

Important safety and procedural guidelines before performing crane maintenance.

Basic Crane Maintenance Schedule

Scheduled maintenance operations for daily, weekly, monthly, and hourly intervals.

Hydraulic Oil and Filter Maintenance

Recommendations for hydraulic oil and filter changes based on service hours.

Washing the Crane

Precautions for washing the crane, emphasizing protection of electrical components.

Paint Maintenance

Tips for touching up paint chips and scratches to prevent further damage.

PTO and Pump Maintenance

Procedure for lubricating PTO and pump splines every six months.

Wire Rope Maintenance

Importance of proper maintenance for wire rope longevity as per ANSI B30.5.

Winch Maintenance

Reference to the winch manual for specific maintenance procedures.

Extension Boom Maintenance

Lubrication of extension weldments if noisy during operation.

Load Hold Test Procedure

Steps to perform a load hold test to check for hydraulic cylinder drift.

Rotation Gear Bearing Maintenance

Procedures for lubricating worm gear, open gear teeth, and rotation bearings.

Worm Gear and Open Gear Teeth Lubrication

Using Moly Lube grease for worm and open gear teeth.

Worm Gear Bearings and Races Lubrication

Applying EP2 grease to rotation gear bearing zerks every three months.

Inner Gear Bearing Race Lubrication

Weekly lubrication of the inner race of the large rotation gear bearing.

Gear-Bearing Bolt Maintenance

Procedures for replacing and securing gear-bearing bolts with threadlocker.

Rotation Gear Bearing Thread Tightening Procedure

Step-by-step procedure for torquing rotation gear bearing bolts using a sequence.

Rotation Gear Bearing Tilt Test

Procedure to test for rotation gear bearing tilt using a dial indicator.

Rotation Gear Bearing Worm End Play and Backlash

Procedures for setting worm end play and gear bearing backlash.

Face Seal and O-Ring Size Chart

Chart correlating hose size with face seal and O-ring part numbers.

Lubrication Recommendations

Recommended lubricants for hydraulic system, gears, cylinders, and compressors.

Chapter 3 - Troubleshooting

Stellar CDT Radio Remote Troubleshooting

Table of symptoms, probable causes, and remedies for radio remote system issues.

Synchronizing Receiver and Transmitter

Procedure for pairing the radio transmitter and receiver by address and channels.

Receiver/Transmitter Identification Tag

Explanation of labels and meanings on the receiver/transmitter unit.

Stellar CDT Radio Error Code Troubleshooting

Troubleshooting common error codes displayed by the radio receiver for specific functions.

Manual Crane Operation

Steps to operate the crane manually when the remote control malfunctions.

Model 14530 Manual Operation

Specific manual operation steps for the Model 14530 crane.

stellar labs 12621 User Manual

Table of Contents

Questions and Answers:

stellar labs 12621 Specifications

Summary