AXLE GP-FIXED 4V7930 - Caterpillar

SEBF8176-01
September 2000
SMCS Code: 5057
GUIDELINE FOR
REUSABLE PARTS
AND SALVAGE OPERATIONS
Reusable Couplings For Caterpillar XT-3, XT-5, and XT-6 Hose
Summary of Revisions
Page Description
All Revised format.
Contents
Introduction 1
Summary 2
Nomenclature for Hose Coupling 2
Coupling Identification 3
Reconditioning Procedures 3
General Information 3
Reconditioning the Flange Head 4
Reconditioning Specifications 4
Flange Head Couplings 4
Face Seal Couplings 5
Visual Inspection 5
Head 7
Outside Stem 8
Inside Stem 9
Collet 10
Sleeve 10
Introduction
This guideline enables dealers and their customers to benefit from cost reductions made possible through an established parts reusability and salvage program. Every effort has been made to provide the most current and relevant information known to Caterpillar Inc. Since the Company makes ongoing changes and improvements to its products, this guideline must be used with the latest technical information available from Caterpillar to ensure such changes and improvements are incorporated where applicable.
For questions or additional information concerning this guideline, contact Caterpillar Service Support Division, Dealer Support (309) 675-5156.
Summary
XT-3, XT-5, and XT-6 reusable hose couplings can be reused many times as long as they are not damaged in certain areas. The only repair method that applies to hose couplings are light deburring. This guideline presents reconditioning procedures, specifications, and visual examples of various "Use again" and "Do not use again" conditions.
For the proper assembly procedures for reusable hose couplings, refer to Special Instructions, SEHS7957, "Use of 6V-4900 Hydraulic Hose Service Press Arrangement".
Nomenclature for Hose Couplings
Illustration 1
Coupling Nomenclature. See Chart A.
Chart A
Coupling Nomenclature
Item Description
1 Flange Head
2 Ring Groove Land
3 Outside Stem
4 Collet
5 Fingers
6 Inside Stem ?
7 Stem Taper
8 Grip Grooves
9 Swivel Nut
10 Seal FaceCoupling Identification
Illustration 2
Coupling identification.
(11) XT-3 (∆) Coupling and Sleeve
(12) XT-5 (+) Coupling and Sleeve
(13) XT-6 (UHP) Coupling and Sleeve
Identification
Symbol Hose
Type Hose
ID Maximum
Working
Pressure Head
Flange
Thickness
∆ XT-3 9.5
(.38) 28,000
(4,000) 6.73
(.265)
∆ XT-3 12.7
(.50) 28,000 (4,000) 6.73
(.265)
∆ XT-3 19.1
(.75) 28,000 (4,000) 6.73-8.00
(.265-.315)
∆ XT-3 25.4
(1.00) 28,000 (4,000) 8.00-9.50 (.315-.375)
∆ XT-3 31.8
(1.25) 21,000 (3,000) 8.00-9.50 (.315-.375)
∆ XT-3 38.1
(1.50) 17,500 (2,500) 8.00-9.50 (.315-.375)
∆ XT-3 50.8
(2.00) 17,500 (2,500) 9.50
(.375)
+ XT-5 All 35,000 (5,000) 14.22 (.560)
UHP XT-6 All 42,000 (6,000) 14.22 (.560)Note: All dimensions are in mm (in) and all pressure is in kPa (psi).
Reconditioning Procedures
General Information
The reconditioning procedure can be used on a coupling. After reconditioning, the coupling may meet "Use again" specifications and thus be re-used. Since a coupling is part of a pressure containment system, all that can be done to recondition the coupling is to remove burrs or raised metal. These flaws can prevent a seal connection from being leak-free or can cause damage to the hose-to-coupling joint.
Reconditioning the Flange Head
Illustration 3
Flange face has minor surface damage with "high" spots.
Use again---
after removing the high spots.
Obtain a clean, ground surface plate
(7B-0337 Plate) or other flat surface.
Place a medium-to-fine grit emery paper onto the surface plate.
Note: Some sandpapers may also be suitable for this procedure. The emery cloth can also be "wet" with clean petroleum solvent in order to reduce friction.
Hold the flange face against the emerycloth.
Illustration 4
Removing burrs and raised metal from the flange face using medium grit emery paper.
Move the coupling laterally back and forth across the emery cloth. Use care to keep the flange face flat on the emery paper. It is not necessary to move the part in a figure eight "8" pattern as is done with piston pump slippers.
Most burrs or high spots can be removed in two to six strokes. Once the surface has been sanded, look for areas that do not shine. These areas mean that the