NICE Apollo 10021790 Adjustable Arm Assembly for 3500 / 3501
The NICE Apollo 10021790 adjustable arm assembly is a factory replacement arm-adjuster component for the Apollo Vanguard 3500 / 3501 articulating swing gate operator family. This assembly helps set and maintain the arm geometry between the operator chassis and the gate. Correct arm adjustment is especially important on column-mount and specialty swing installations where the pivot geometry controls how smoothly the gate opens and closes.
A worn, bent, or poorly adjusted arm assembly can cause binding, rough movement, uneven speed, motor strain, and inconsistent stopping. This part should be ordered by part number and operator model, not by appearance, because Apollo swing operator arms and brackets can look similar but use different geometry and connection points.
Compatible With
- NICE Apollo Vanguard 3500 swing gate operator
- NICE Apollo Vanguard 3501 swing gate operator
- Select Apollo 3500-family articulating arm assemblies
- ABOX35 and related 3500 arm geometry where the parts diagram calls for 10021790
- Column-mount swing gate applications using the correct Vanguard 3500 / 3501 arm adjuster
Features and Specifications
| Manufacturer | NICE Apollo |
|---|
| Product Type | Adjustable arm assembly / arm adjuster |
|---|
| Part Number | 10021790 |
|---|
| Application | Articulating arm adjustment and service |
|---|
| Compatible Operator Type | Apollo Vanguard 3500 / 3501 swing gate operators |
|---|
| Material | Aluminum assembly in common listings |
|---|
| Notes | Geometry and adjustment must match the installation diagram |
|---|
Also Known As / Related Part Numbers
- 10021790
- NICE-10021790
- Apollo 10021790
- Arm adjuster assembly
- Adjustable arm assembly
- 3500 arm adjuster
- 3501 arm adjuster
- ABOX35 related arm adjuster
Technician Note
If an arm adjuster is damaged, inspect the gate hinges and mounting geometry before installing the new part. A gate that is hard to move by hand will continue to stress the arm assembly.
Before Ordering
- Confirm the operator is a Vanguard 3500 or 3501
- Check the old arm adjuster for matching shape and mounting points
- Inspect the ABOX35 arm, gate bracket, and chassis pivots
- Verify gate hinge condition and free movement
- Set travel and safety functions after mechanical repair
Professional Advisory
Arm adjustment changes how the operator moves the gate. Use proper mechanical support and do not work on a gate that can swing freely or unexpectedly.
Important Ordering Warnings
- Not confirmed for all Apollo swing operators
- Do not substitute for unrelated actuator arms
- Incorrect adjustment can cause binding and operator damage
Product Questions and Answers
What is the 10021790 arm adjuster used for?
It is a replacement adjustable arm assembly for select Apollo Vanguard 3500 and 3501 swing gate operators.
Is this compatible with Apollo 3600 models?
Some 3500-family listings mention broader Vanguard references, but the strongest compatibility is 3500 / 3501. Verify by parts diagram before ordering for 3600.
What symptoms indicate a worn arm adjuster?
Binding, loose arm movement, rough gate travel, bent linkage, or inconsistent gate position can point to arm or bracket problems.
Can I adjust the arm to compensate for bad hinges?
No. A hard-moving gate should be repaired first. Arm adjustment should not be used to hide hinge, post, or gate-frame problems.
Does this include the complete operator?
No. It is an arm adjuster assembly, not the complete chassis, motor, control board, or gate bracket kit.
