Parker Hannifin Corporation
Automation Actuator Division
Wadsworth, OH 44281
15
Automation
ET Series
PM-ET01/USA
Stepper and Servo Driven Linear Actuators
53
Adjusting Timing Belt Tension
Procedure
1.
Remove four button head cap screws (52).
2.
Remove cover (50) and gasket (51) from end cap (44).
3.
Loosen four button head cap screws (55). Loosen just enough to allow motor to move freely.
4.
Adjust belt (47) tension. Refer to Belt tension table for deflection values. A belt with correct tension should deflect the listed
value with proper finger pressure at the mid-span of the belt.
• Using belt tension tool
Attach belt tension tool assembly to mounting plate (53). Turn adjustment screw as required to properly
tension the timing belt. (Tensioning procedure supplied with tool.)
• By hand
a. Maintaining proper force on the belt at the middle of the belt span (see chart), tighten button head cap screws (55).
b. Check for proper belt deflection.
5.
Visually inspect for proper seating of belt teeth in pulley grooves.
6.
Torque the four button head cap screws (55). (Refer to the torque values chart located earlier in this section.)
7.
Place gasket (51) and cover (50) on end cap (44), securing with four button head cap screws (52).
8.
Torque the four button head cap screws (52) as required. (Refer to the torque values chart located earlier in this section.)
Maintenance/Adjusting Timing Belt Tension
(available from the Division
)
Dimension "A"
Cylinder
Deflection Force (lb)
Model
Value
32
0.034"
.4 - .7
50
0.048"
.9 - 1.75
80
0.061"
.9 - 1.75
Stepper
(except S106)
80
0.061"
1.6 - 2.8
Servo & S106
100
0.086"
12 - 13
(At mid-span of belt)