Emerson Bettis M Series - Page 8

Installation, Operation and Maintenance Manual
MAN-02-01-39-0704-EN Rev. 0 July 2019
Jackscrew Override
Figure 2 Jackscrew Override - Models 006 through 270
OPEN
SHUT
OPEN
SHUT
JACKSCREW FULLY RETRACTED JACKSCREW EXTENDED
Actuator stroke
adjusting screw
Jackscrew seal
Stroke adjusting screw
Jackscrew
Lock nut
Seal
Note: Air escapes unless
jackscrew is fully retracted
Figure 3 Jackscrew Override - Models 370, 575 & 740
OPEN
SHUT
OPEN
SHUT
Lock nut
Sealed jackscrew
assembly
Handwheel
Lock nut
Stroke
adjusting
screw
Stroke adjusting screw
Figure 4 Hydraulic Override
OPEN
SHUT
OPEN
SHUT
Selector valve
Reservoir
Handle
Manual Handpump Specications:
1. Maximum reservoir ll volume = 75 cu. in.
2. Pump relief pressure = 1500 psi
3. Pump volume/stroke = 0.66 cu. in.
4. Handle length = 24 in.
5
Section 3: Jackscrew Override