Section 3: Actuator Reassembly; General Reassembly; Drive Module Reassembly - Emerson Bettis GTD Series Service Instructions Manual

Section 3: Actuator Reassembly

January 2013
Section 3: Actuator Reassembly
3�1

General Reassembly

CAUTION: CHECK SHELF LIFE OF SEALS
Only new seals, that are still within the seals expectant shelf life, should be installed into
actuator being refurbished.
3.1.1
3.1.2
3.1.3
CAUTION: CHECK PARTS FOR SIGNS OF WEAR
Actuator parts that reflect any of the above listed characteristics should be replaced with
new parts.
3.1.4
NOTE:
The parts and seals used in the actuator drive module and GTD gas cylinder will be assembled
using lubricant as identified in Section 1 step 1.6.1. The parts and seals used in the actuator
GTO oil cylinder will be assembled using lubricant as identified in Section 1 step 1.7.1.
3�2

Drive Module Reassembly

NOTE:
Review section 3.1 General Reassembly before proceeding with Drive Module Reassembly.
3.2.1
NOTE:
The guide bar bearing must be press fit into guide block guide bar bore with the seam
located ±5° degrees of the top or bottom centerline as shown in section A-A.
9
Remove and discard all old seals and gaskets.
All parts should be cleaned to remove all dirt and other foreign material prior to
inspection.
All parts should be thoroughly inspected for excessive wear, stress cracking,
galling and pitting. Attention should be directed to threads, sealing surfaces and
areas that will be subjected to sliding or rotating motion. Sealing surfaces of the
cylinder and piston rod assembly must be free of deep scratches, pitting, corrosion
and blistering or flaking coating.
Before installation coat all moving parts with a complete film of lubricant. Coat all
seals with a complete film of lubricant, before installing into seal grooves.
If the guide bar bearings are being replaced install new bearings into guide block
assembly (1-30).
Service Instructions
133893 Rev. C
Actuator Reassembly