Skip to main content

Repair Instructions for 5", 6", and 7 1/2" LJTRQ Rotary Joints

Effective: September 26, 2025

Download PDF
Hero
Launch Interactive 3D View

Introduction

Read all of the instructions before proceeding.

Refer to Kadant Johnson assembly drawing for part identification and to drawing A37640 for torque specifications. For easy identification, parts used in individual steps are often accompanied with their position in the assembly drawing [e.g. gasket (8B)]. Tighten all fasteners in a star pattern. Certified drawings are available upon request. Dimensions are for reference only and subject to change.

Bolt-Torque
How to Torque a Flange

Safety

warning symbol

This safety symbol alerts you to risk of death or injury if the instructions are not followed. In all steps, death or injury may result if the machine is not de-energized, depressurized, cooled, and stopped. Death or injury may occur if the product is operated with a fluid type or at a pressure, temperature, or speed that does not meet its specifications. Death or injury may occur if heavy parts and pinch hazards are not handled properly. Follow your company’s safety procedures.

Step 1

Remove the head (2).

NOTE: The rotary joint can be serviced on the machine without removing the body (1). An assembly tool is available that will aid in removal of wearable parts.

symbol

Equipment must be cool and free of pressure.

Step 2

Install the assembly tool and turn the handle until the tool is bottomed out on the nipple (4).

Step 3

Loosen and slide the nipple flange (5) away from the journal. Remove the split wedges (55).

Step 4

Turn the handle on the assembly tool to remove the nipple tube (4). Capture the nipple flange (5) as the nipple tube is removed. Remove the assembly tool to remove the nipple tube. Remove the seal ring (6).

symbol

Spring force is present during this step.

Step 5

Separate the nipple body (4A) and spring (7) from the nipple tube. Remove the snap ring (81A) and remove the spring shoulder (81). Remove the O-ring (4B) from the nipple body and discard.

Step 6

Discard the seal ring, gaskets, and O-rings. Inspect and clean all gasket, O-ring, and sealing surfaces. Replace any damaged parts. If the wear plate (16) is damaged, remove and replace using a new gasket (8R).

Step 7

Install a new O-ring (4B) into the nipple body (4A). Install the spring shoulder (81) followed by the retaining ring (81A). Install the spring (7) followed by the nipple body (4A).

Note: Apply a generous amount of O-ring lube to the O-ring and the surface of the nipple tube where the nipple body rides.

Step 8

Install a new seal ring into the body (1). Pass the nipple tube assembly through the seal ring and wear plate. Install the nipple flange (5) over the nipple tube (4). Place the split wedges (55) into the recess of the nipple tube.

Important: Make sure the keys on the nipple tube are aligned with the keyways on the nipple body.

Step 9

Install the assembly tool. Place a new metal gasket (8Q) into the journal flange. Turn the handle on the assembly tool until the end of the nipple tube (4) has passed into the journal flange. Install the nipple flange (5).

Important: Make sure the keys and keyways have engaged.

symbol

Spring force present during this step.

Step 10

Remove the assembly tool. Using a new gasket (2), install the head (2).

Questions or Comments?

If you have installation questions or comments to improve these instuctions, we are here to help! Fill out the form below or call 269-278-1715.







R-5", 6", and 7 1/2" LJTRQ Rotary Joints

Print Friendly and PDF

The Kadant Johnson Warranty
Kadant Johnson products are built to a high standard of quality. Performance is what you desire: that is what we provide. Kadant Johnson products are warranted against defects in materials and workmanship for a period of one year after the date of shipment. It is expressly understood and agreed that the limit of Kadant Johnson’s liability shall, at Kadant Johnson’s sole option, be the repair or resupply of a like quantity of non-defective product.

Kadant Johnson rotary joints and accessories could be subject to European Pressure Equipment Directive 2014/68/EU (PED). Modifications or changes to rotary joints and/or accessories are only permitted upon approval of Kadant Johnson. Only genuine Kadant parts and original accessories will ensure the safety of these assemblies. The use of other than original parts voids the warranty and will lead to forfeiture of the declaration of conformity and will invalidate any liability for damages cause thereby.