Bray 98 Series - Manual (Page 10)

All information herein is proprietary and confidential and may not be copied or reproduced without the expressed written consent of
BRAY INTERNATIONAL, Inc. The technical data herein is for general information only. Product suitability should be based solely upon customer’s
detailed knowledge and experience with their application.
S98 O & M : 10
Series 98 Operation & Maintenance
6.0 Maintenance
Series 98 actuators are designed for long service periods
between maintenance, in demanding conditions. However, a
preventative maintenance program is essential for ensuring good
performance, safe operation, extended life of equipment and to
avoid expensive down time.
The service conditions, load and cycling f requenc y may vary
largely, which would require the maintenance program to
be suitably designed, with sound judgment of the working
conditions. Contact manufacturer for assistance.
In general, the scheduled service shall include replacement of all
seals and wear parts.
Seals shall be replaced if the actuator is in storage or inactive for
long periods of time.
6.1 Lubricants and Maintenance Consumables
The Standard actuators use following lubricants
Shell Alvania EP2 (LF) grease for the Torque & Spring
Modules
Molykote 55 for the Pressure Module.
6.2 Disassembly, Service & Reassembly of Modules
CAUTION
Prior to disassembly of the actuator, disconnect all air and electrical
supplies from actuator, remove all accessories from actuator and
dismount actuator from valve (or override gearbox, if present).
NOTICE
Replacement of the DU (items 4, 9, 26 & 27) bushings may
require workshop infrastructure to remove the worn bearings
from their housing and to press fit new ones, without damaging
the housings.
Drawing # ES- 00019 – Spring Return Actuator Assembly
Drawing # ES- 00020 – DA Assembly
Drawing # ES- 00021 – DD Assembly
(Refer to the Bray website for current revisions of the drawings)
6.3 Spring Module
WARNING
Follow the sequence of steps as described below. Injury or damages
may occur if critical steps are bypassed or shortcuts taken.
Never attempt to cut open the Spring Module welded assembly,
the spring is energized and can cause severe injury or death and
extensive damages.
Note: If the actuator is provided with a Jackscrew or Hydraulic
override cylinder on the Spring Module, first ensure to back off
the override fully, to unload it from any spring force. Remove the
override assembly before disassembling Spring Module.
6.3.1 Removing the Spring Module

Nuts (18) on the torque module (and extended stopper, if
provided). Apply air pressure to pressure module adaptor
port (rod end port), raising pressure slowly, enough to
release spring force on the Travel Stop Bolt (19).

(and Extended Stopper/Jackscrew, if present) and release air
pressure. This will relieve the spring preload.
CAUTION
Never try to remove the Spring Rod without completely relieving
the spring load on it.

present, from the Spring Module by unfastening the bolts
holding the assembly on the End Plate.
WARNING
The Spring Module is welded into an integral component and the
internal components cannot be disassembled.
Spring within is compressed. Never attempt to modify or cut open
this moduloe

End Cover Bolts (58) and remove the End Cover (55) and
the O-ring (59). Using an extended socket spanner /tube
spanner, unscrew and disconnect the Spring Rod (54) from
the Guide Block (25) in Torque Module. A retainer ring on
the threaded side of the Spring Rod stops it from being taken
out of the Spring Module.