Rothenberger ROBULL 2 Instructions D'utilisation page 4

1. General characteristics . . .
2. Starting up and using the two-plate pipe bender . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3. Training and maintenance
4. Troubleshooting . . . . . . . . .
4.1 The piston fails to advance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.2 The piston advances only in the absence of load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.3 The piston stops before reaching the end of its stroke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.4 The piston advances and returns with each pump stroke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.5 The piston advances well under load but the lever returns suddenly. . . . . . . . . . . . . . . . . . . . . . . . . 7
5. Exploded drawing . . . . . .
INSTRUCTIONS FOR USE
1. General characteristics
With the rothenberger pipe bender you can cold bend
galvanized or black steel pipes of the following types,
without filling, and without reamers on the inside:
Steel Pipe EN 10255 Medium and heavy series
The angles we can effect with these benders range from
0º to 180º. A right angle can be made directly, while
others can be effected with several curves.
These angles can be in different planes. The equipment
could be hand operated or electrically, with automatic,
piston return.
Its main features are:
• Nominal power: 8 Tn
• Maximum travel: 270 mm.
• Piston diameter: 34 mm.
• Pump piston diameter:
16 mm (hand operated) y 10 mm (electric).
• Volume of top-up oil: 850 cc.
INDEX
• Oil to be used: ISO 32 or similar.
2. Starting up and using the two-plate
pipe bender
1. Fit the guide plates to the front flange and secure
them with pins.
2. Fit the diabolos to the lower plate, in the position
corresponding to the size of the pipe to be bent. At the
same time fit the diabolo in position in accordance with
the size of the pipe.
3. At the end of the piston, fit the former corresponding
to the size of the pipe that it is desired to bend. Place
the pipe in position and put down the upper plate.
4. In the event that the pipe to be bent is welded, the
weld beam should be placed either in the upper or
lower side position.
5. Before starting to use the pipe bender, release any
pressure there may be in the valve system of the
hydraulic circuit. Do this by opening the return cock
and pumping several times with the lever or switch on
the motor.
8 8 8
INSTRUCTIONS FOR USE
6. Make sure the return valve is well closed, and the tank
plug open
6
7. You can then begin to operate the pump lever or
switch on the motor.
8. When the bend has been finished, return the piston
by loosening the return valve on the side of the
distributor.
7
3. Training and maintenance
7
Check oil level at regular intervals. When topping up,
be especially sure to filter the oil so that it is free of
extraneous matter. Check its level by lifting the front part
of the unit about 45º and looking in. The oil should reach
the level of the hole used for loading it in.
8-9
4. Troubleshooting
Cause
The piston fails to advance
Insufficient oil
Return valve not closed
Air in the system (pump)
The piston advances only in the absence of load
Return valve is poorly closed
There is a foreign body in the intake valve
The piston stops before reaching the end of its stroke
Very low oil level
Tank plug closed
The piston advances and returns with each pump stroke
Foreign body in the output valve, or air in the pipes
Foreign body in the intake valve
The piston advances well under load but the lever returns suddenly
Foreign body in the check valve
9
When the oil has been topped up, fit the unit in inclined
position, i.e. almost vertical, and with the piston upward.
Open the return valve and work the pump with the lever
until suction is as it should be. After a short space of
time with the position unchanged, and when suction is
satisfactory, fit in horizontal working position.
In the event that it is necessary to top up, use a high-
quality hydraulic oil. Never use brake fluid. Bear in mind
that excess of oil will render the equipment inoperative.
Accordingly fill to about 70% of tank capacity (1250 cc),
first removing the cap.
Close the tank plug for transportation
Solution
Check oil level
Close return valve
Open the return valve and operate the pump lever until
the air is released. To do this, position the unit with
the piston upward, so that the oil will descend to the
distributor
Close the return valve
Disassemble the intake valve and clean it thoroughly, first
having made the piston return
Top up the oil
Open the tank plug
Position the cylinder vertically, first having made the
cylinder return. Take apart the output valve and clean it.
Take apart the intake valve and clean it, first having made
the piston return.
Remove the check valve, disassemble it, and clean it, first
having made the piston return.