# Adjusting the AutoTrim Valve

Regularly check the function of the AutoTrim valve.

The AutoTrim valve gives a reduced speed during rundown and will automatically switch to full speed/power after 1-2 pulses. If this is not the case, follow steps 1-3.

1. Make sure that the AutoTrim function is activated correctly.

2. Check the recommended reduced (free) speed, according to the table AutoTrim Settings for Regular Pressure Tools or AutoTrim Settings for Low Pressure Tools. Adjust if needed.

   Adjusting the Reduced (free) Speed

3. Adjust the switching point valve.

   Adjusting the Switching Point Valve

- If the valve is too closed, the AutoTrim will not shift to full speed and power when pulsing starts. Turn the valve counter clockwise 90 degrees to find the correct switching point. Repeat until correct switching point is reached.

- If the valve is too open, the AutoTrim will shift to full speed and power too quickly (during rundown). Turn the valve clockwise 90 degrees to find the correct switching point. Repeat until correct switching point is reached.

## Re-setting the Switching Point of the AutoTrim Valve

1. Close the switching valve completely, by turning it clockwise, until it stops.

2. Open the valve counter clockwise 6.5 turns with an Allen key.

3. If needed, turn the valve 90 degrees at a time to find the correct switching point, as described above.

4. If correct switching cannot be achieved with 5-8 turns, from fully closed, then service may be needed, see Service section.

## AutoTrim Settings for Regular Pressure Tools

Model | Reduced (free) speed (rpm)
--- | ---
EP4PTI9 HR10-MT / HR42-MT | 3100-3400
EP5PTI19 HR10-MT / EP5PTI17 HR42-MT | 3100-3400
EP6PTI32 HR10-MT / EP6PTI28 HR42-MT | 2900-3200
EP7PTI55 HR10-MT | 2875-3125
EP8PTI70 HR10-MT | 2675-2925
EP9PTI80 HR13-MT | 2725-2975
EP11PTI100 HR13-MT | 2325-2525
EP13PTI150 HR13-MT | 2225-2475

## AutoTrim Settings for Low Pressure Tools

Model | Reduced (free) speed (rpm)
--- | ---
EP5PTI15 HR10-MT-L / HR42-MT-L | 2600-3100
EP6PTI25 HR10-MT-L / HR42-MT-L | 2600-3100
EP7PTI35 HR10-MT-L | 2650-3050
EP8PTI45 HR10-MT-L | 2650-3050
EP9PTI65 HR13-MT-L | 2450-2850
EP11PTI80 HR13-MT-L | 2300-2600
EP13PTI110 HR13-MT-L | 2150-2550

Improper AutoTrim function may result in:

- Increased scatter (wrong torque).

- Longer tightening time.

- No shut-off.

Relevant Information

- Switching to AutoTrim Function