Applies to machines built from:
This procedure tells you how to inspect the plunger  and adjuster  on the double arm for a Side-Mount Tool Changer (SMTC).
When you do maintenance or repair on CNC machines and their components, you must always follow basic safety precautions. This decreases the risk of injury and mechanical damage.
Do these steps before you do work in the machine or in the control cabinet:
Set the main circuit breaker to the OFF position.
Use an approved lock with an approved safety tag. Always follow lock-out procedures in accordance to local government rules.
After turning off the machine, wait at least 5 minutes before working in the control cabinet, to allow power to dissipate. Wait for the voltage indicator LED on the vector drive to go off completely.
Always turn off the main air supply when you work on any part of the pneumatic system.
Make sure to rest the spindle head on a block of wood when work is done on a vertical axis. This will prevent any unintended movement that could result in the axis falling.
Never alter any safety circuits on the machine.
You should not do machine repair or service procedures unless you are qualified and knowledgeable about the processes. Serious damage to the machine components can result in costly repairs. The service technicians at your Haas Factory Outlet (HFO) have the training and experience, and are certified to do these tasks safely and correctly. The repair and service work performed by your HFO is protected with a limited warranty.
danger: Some service procedures can be dangerous or life-threatening. DO NOT attempt a procedure that you do not fully understand. If you have any doubts about doing a procedure contact your Haas Factory Outlet (HFO) and schedule a service visit.
Remove all tools from the carousel and the spindle.
In MDI mode, push ATC FWD.
When the arm moves down and starts to turn, immediately push EMERGENCY STOP.
Remove these parts from the double-arm:
- the bottom plunger cover screws 
- the plunger cover 
- the spring 
- the plunger 
Examine the end of the plunger shaft for burrs . Remove all burrs from the end of the plunger shaft.
Measure the length of the plunger shaft. If it is less than 1.75" (44 mm) replace it.
Apply a light layer of molybdenum grease to the plunger, the plunger cover, and the spring. Do this when you reassemble it.
caution: The adjuster assembly is spring-loaded. The adjuster assembly can fly out when you remove the adjuster cover.
Slowly remove the adjuster cover.
Remove these parts:
- Nut 
- Shim Washers 
- Slide 
- Adjuster Shaft Assembly 
- Spring 
Examine the end of the adjuster shaft for burrs. Remove all burrs from the end of the adjuster shaft.
Apply molybdenum grease to the slide and adjuster assembly. Reassemble it.
Push down on the plunger  to make sure it moves freely.
Push down on the plunger  and hold it down. Then push on the slide  to make sure it moves freely.
Push down on the plunger  and hold it down.
Put a tool holder  into the arm. During correct operation, the slide  moves in.
Release the plunger .
Try to remove the tool holder . During correct operation, the slide does not move in and the tool holder locks in position.
Measure the space between the slide and the tool holder. Use a feeler gauge . The correct space is between 0.015" (0.38 mm) and 0.020" (0.51 mm). If the machine is a DM-1 or DT-1, the correct space is between 0.005" (0.13 mm) and 0.15" (0.38 mm).
Add or remove 0.01" (0.25 mm) shim washers until the space is correct.
note: Refer to Step 5 for an illustration of the shim washers.
. Do the instructions to complete the TOOL CHANGER RECOVERY
Do this procedure again for the plunger and adjuster assembly on the other side of the double arm.