Usage:
XT hose assemblies can be fabricated when the new 6V4900 Hose Press Arrangement is used. The 6V4900 has the 6V4880 Hose Press Frame and all tools needed to service all sizes of XT-3 Hose. The new arrangement is made up of several improved tool groups, and has the same type of tools as the former 7S1100 Hose Press Group. These include the 7S1126 Skiving Group, the 7S1125 Protractor Group, and all sizes of finger expanders, stem pushers, and stem expanders. Note, the 6V4900 Hose Press Arrangement does not include a hydraulic pump. The pump must be ordered separately.
Illustration 1. New hose press frame and optional items.
6V4880 Hose Press Frame
The 6V4880 Hose Press Frame (Illustration 1) is the "press" part of the 6V4900 Hose Press Arrangement. It is similar to the former 5S2801 Hose Press Frame but has:
- - a longer stroke
- - a larger opening between tie rods
- - wider tooling openings between the fixed (can not be moved) and movable (can be moved) bolsters. With the former hose press frame it was possible for tooling or hose components to get in the way when the movable bolster was retracted.
- - a guard that is part of the clamping bar and screw (Illustration 2). The front tooling can no longer be clamped (held in position) without use of the guard as was possible with the former hose press.
- - a larger opening between tie rods
Illustration 2. Location of shield and clamping screw in 6V4880 Hose Press Frame.
Both the new and former hose press frame have a 445 kN (50 ton) capacity. No tooling comes with the 6V4880 Hose Press Frame if it is ordered by itself.
6V4860 XT-5 Tool Group
To fabricate or recondition XT-5 hose assemblies, the 6V4860 Tool Group is needed, in addition to the 6V4880 Hose Press Frame and many tools from the 6V4900 Hose Press Arrangement. Included in the 6V4860 Tool Group are special hose remover tools for 19 mm (.75") I.D. and 25.4 mm (1.00") I.D. XT-5 hose (Illustration 3). These two sizes of XT-5 hose are the most difficult to remove from the coupling, when the coupling is to be used again. Use of these tools is explained in Special Instruction, "Use of 6V4900 Hydraulic Service Press Arrangement," Form SEHS7957-01. A complete list of part numbers for the 6V4860 Tool Group is available in the Caterpillar Tool Guide.
Illustration 3. Remover tool for XT-5 hose.
6V4974 Hose Press Stand
Because the new 6V4880 Hose Press is larger than the former hose press in almost all dimensions, it is not practical to install on a standard work bench. The new 6V4974 Hose Press Stand permits the hose press to be taken off the workbench and put anywhere in the shop. The foot switch and hydraulic pump can be fastened to the press stand, as shown in Illustration 4. Since the area under the stand is open, tooling and hose components can not fall between the bolsters and get in the way. If desired, the 6V4974 Hose Press Stand can be fabricated according to FT1643 drawings, available from your Division Service Manager. The hardware which follows is needed for assembly of either stand:
When the 6V4880 Hose Press Frame is fastened to the 6V4974 Hose Press Stand along with a new hydraulic pump, use the parts which follow to connect the pump to the press:
A pressure gauge can be installed on the hose press so hydraulic oil pressure can be noted during assembly and disassembly of hose couplings. See Illustration 5.
Illustration 4. The major components of the 6V4974 Hose Press Stand.
Illustration 5. Location of the 9S2240 Gauge.
6V6022 and 6V6023 Skiving Gauge
The new 6V6023 Skiving Gauge is used to find the length to which the hose must be skived (Illustration 6). The lengths are marked according to hose I.D. and type - XT-3 or XT-5. The 6V6023 Skiving Gauge is a piece of square aluminum tube around which is wrapped a decal. The decal (Form SEHS7997) can be replaced if it is damaged. The 6V6022 Skiving Gauge Assembly includes the 6V6023 Skiving Gauge and a length of chain so the assembly can be permanently fastened. The 6V6023 Skiving Gauge replaces the former 7S5091 Skiving Gauge, which will no longer be available.
Illustration 6. The 6V6023 Skiving Gauge.
6V4850 and 6V4890 Hydraulic Pumps
The new 6V4850 Hydraulic Pump and 6V4890 Hydraulic Pump are now available. The new pumps are not part of the 6V4900 Hose Press Arrangement; they must be ordered separately. The new pumps are quieter than any former pumps because they use induction motors instead of universal motors. And, because of their higher horsepower and pumping capacity, the new pumps can do the work faster.
Because induction motors are used to power the hydraulic pumps, the voltage and cycle specification of the motor must be the same as those of the available power supply. The motor in the 6V4850 Hydraulic Pump comes from the factory ready to operate on 115V, 60 cycle current. If the available shop current is 230V, 60 cycles, the motor can be re-wired (changed). Use the instructions that come with the pump. The motor in the 6V4890 Hydraulic Pump comes from the factory ready to operate on a 220V 50 cycle current and can also be re-wired to 110V 50 cycle.
Both pumps come equipped with an electrically operated control valve, activated by a foot switch. The 6V4939 Foot Switch permits the operator to use his hands to align (bring together) tools and couplings before the press is activated (Illustration 1). The foot switch is also available as a separately serviced part.
Also, any of the Caterpillar Service Tool pumps can be used with the new hose press.
