Relief Setting
The relief setting on the control console is hand-adjustable and provides
the ability to control the maximum amount of pull. Simply rotate the extended knob
on the left side of the panel counter-clockwise to reduce the hydraulic relief setting.
When the capstan begins to slow, rotate the knob clockwise again to regain full
speed. This procedure will set the relief pressure just above the current operating
pressure. Setting the relief slightly above the required amount of pull will protect
your equipment and plant against excessive pulling pressures should an encum-
brance be encountered.
Speed/Pull Power Controls
The electronically controlled two-speed motor can be activated by the
weather-proof switch located at the console. The indicator lamp will light when the
unit is in high speed. The low speed/high torque setting provides twice the pulling
power and will result in a fifty percent hydraulic system pressure drop. To determ-
ine the amount of pull being exerted, read the pressure gauge and refer to the chart
on the control console to determine the applied pull. The following
Pulling Power
Chart
relates available pull in Low Speed and High Speed modes to input pressure.
Pulling Power Chart
Pressure
(PSI)
Pull In Low
Speed (LBS)
Pull In High Speed
(LBS)
600
800
400
900
1200
600
1200
1600
800
1500
2000
1000
1800
2400
1200
2100
2800
1400
2250
3000
1500
Pressure
(PSI)
20" Capstan
11" Capstan
Pull In Low
Speed (LBS)
Pull In High
Speed (LBS)
Pull In Low
Speed (LBS)
Pull In High
Speed (LBS)
600
800
400
1300
650
900
1200
600
1900
950
1200
1600
800
2500
1250
1500
2000
1000
3200
1600
1800
2400
1200
3800
1900
2100
2800
1400
4400
2200
2250
3000
1500
5000
2500
Operation & Maintenance Manual
Model 1570-B Puller
09/2010
Page 7
