Installation, Operation and Maintenance Manual
VA-DC-000-1879 Rev. 0
April 2021
1
Section 1: Introduction
Introduction
Section 1: Introduction
1.1
General M18 Service Information
1.1.1
M18 is a compact modular hydraulic override system designed for use with
Bettis Double-Acting and Spring-Return Actuators. The system incorporates
a piston type hand pump and a fluid reservoir.
NOTE:
The M18 fluid reservoir is required because of the hydraulic cylinder differential, which is
due to the inboard piston rod displacement.
1.1.2 MAINTENANCE:
1.1.2.1
Bettis does not recommend periodic field maintenance for the
M18 Manual Hydraulic Override System (pump and reservoir).
1.1.2.2
The only time the M18 Manual Hydraulic Override System should be
disassembled is when either the pump or the reservoir fails to perform
its manual hydraulic override function.
1.1.2.3
When possible the M18 package should be returned to the factory
for maintenance.
1.1.3
Numbers in parentheses ( ), indicate the bubble number (reference number) used
on the Bettis Assembly Drawing VA-ED-005-1120.
NOTE:
Do not use Teflon tape on M18 system threads.
1.1.4
Use a non-hardening thread sealant on all system threads.
!
CAUTION
Apply thread sealant per the manufacturer’s instructions.