Easy
15-30 minutes
Bypass Kit, Actuated Valve Wit JC800-52BYPASS
OEM part for: Rolair
Part Number: JC800-52BYPASS
$36.12
In Stock
Ships within 1 business day 
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Compatibility
This part will fit the following 1 machine
Rolair
JC10 1HP Hand Carry Compressor View Diagrams & Manuals
This item works with the following types of products:
- Compressor Parts
This part replaces obsolete part #: JC800-52
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Part was fine. Didn't fix problem.
Part was fine but it didn't solve problem.
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December 2, 2019
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Customer Repair Instructions ?
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.
Air escaped from the solenoid-operated unloader valve after the compressor cycled when first powered up. After the initial cycle, the motor hummed and but couldn't start untl the system was almost c
Dave - November 18, 2021
👍 2 of 2 people found this instruction helpful
Tool Type
Compressor
Difficulty
Easy
Time
30-60 minutes
Tools Used
Wrench Set, Wire cutters
I first suspected the solenoid-operated unloader valve (#52 on the exploded drawing), which relieves pressure from the pump head at the end of each cycle to reduce the load on the motor when the pressure switch calls for the pump to restart, but I wasn't sure, so I ordered a check valve (#51), too.
The replacement part for the factory installed (solenoid-operated) unloader mechanism is a bypass kit, consisting of a nylon tube and fittings for each end. This eliminates the solenoid-operated mechanism altogether by connecting the check valve to a valve already present on the existing pressure switch. Complete instructions are included, and installation was easy, but this part didn't fix my problem.
Replacing the check valve did fix the problem, though. As I should have figured out to begin with, what was going on was that after the compressor ran its first cycle, the check valve didn't close, so the unloader valve, which opened at the end of the cycle as it's supposed to, let air air out. Since the malfunctioning check valve let the pump head stay pressurized, providing too much resistance for the motor to start.
My 7 year old compressor works like new, now, and I'm happy. My advice: if your compressor has symptoms similar to what mine had, start with the check valve.
The replacement part for the factory installed (solenoid-operated) unloader mechanism is a bypass kit, consisting of a nylon tube and fittings for each end. This eliminates the solenoid-operated mechanism altogether by connecting the check valve to a valve already present on the existing pressure switch. Complete instructions are included, and installation was easy, but this part didn't fix my problem.
Replacing the check valve did fix the problem, though. As I should have figured out to begin with, what was going on was that after the compressor ran its first cycle, the check valve didn't close, so the unloader valve, which opened at the end of the cycle as it's supposed to, let air air out. Since the malfunctioning check valve let the pump head stay pressurized, providing too much resistance for the motor to start.
My 7 year old compressor works like new, now, and I'm happy. My advice: if your compressor has symptoms similar to what mine had, start with the check valve.
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Compressor would run until relief valve opened
Richard - May 27, 2021
Tool Type
Compressor
Difficulty
Easy
Time
15-30 minutes
Tools Used
Pliers, Wrench Set, Adjustable Wrench, Teflon thread sealant
Step by step instructions were included with my order. Unscrewing the existing check valve took a little effort. Otherwise, an easy repair.
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David - December 26, 2019
Tool Type
Compressor
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver, Adjustable Wrench, Wire cutters
Removed old and installed new bypass kit from tank to pressure switch
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Pressure regulator kept leaking after compressor cycle. Wouldn't generate another cycle.
Brian - December 6, 2019
Tool Type
Compressor
Difficulty
Easy
Time
15-30 minutes
Tools Used
Wrench Set
Replaced the bypass kit but still didn't fix. It turns out it was a piece of debris in the check valve. Is working fine now.
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All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
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