Usage:
Description Of 6V200 Hydraulic Wrench
1. Frame
2. Hydraulic cylinder
3. Lever arm
4. Ratchet gear
5. Square drive
6. Reaction arm
1 6V2081 Square Drive (5) is standard equipment and 6V2079 Square Drive (7) is available for limited clearance use. Holes (8) in the square drives permit setscrew (9) to hold the square drives in the ratchet gear.
2 Bleed valve (10) will release oil if the pressure in the cylinder goes above approximately 42880 kPa (6200). Reaction arm (11) can be put in one of eight positions. Loosen bolt (12) until arm (11) can be moved. Engage dowel (13) in a desired hole (14) and tighten bolt (12).
3 Decal (15) (Form SEHS7611) is a torque/pressure conversion table which changes pressure to torque in both English and metric units. In the cycle to loosen or tighten a fastener, two holes (16) in the guard permit the color red to be seen when the cylinder is fully extended or retracted. Also, a noise (click) can be heard as two levers (pawls) fall into place at the same time. Marks (17) have been made evenly on the drive sleeve of the hydraulic wrench so that the torque-turn method of tightening a fastener can be used.
Schematic Of 6V200 Hydraulic Wrench
Use Of 6V200 Hydraulic Wrench
1 Arrows on ratchet arm guard (1) show on which side of 6V200 Hydraulic Wrench (2) the socket must be used to loosen or tighten the fastener. Also, the socket is on the same side as the torque/pressure conversion label to loosen and on the same side as the "Caterpillar Service Tool" label to tighten.
2 To loosen a fastener, install 25.4 (1.0") drive socket (3) of of size on the fastener. Put hydraulic wrench (2) in position (see Step 1) with reaction bar (4) against a solid surface as shown and adjust driver (5) to fit in socket (3). The hydraulic wrench should be kept as nearly parallel to the fastened surface as possible. Connect hydraulic hoses (6) from the hydraulic pump to the hydraulic wrench.
3 If the hydraulic pump has an outside pressure regulator (7), set the regulator so the pressure is limited to 42,880 kPa (6200). This will permit the application of maximum torque from the hydraulic wrench to the fastener. Operate lever (8) and the pump control to permit the cylinder rod to be extended. Just before the cylinder rod is fully extended, a sound (click) can be heard as the assurance lever (pawl) engages the next gear tooth. The red mark can be seen in front opening (9). Operate lever (8) and the pump control to retract the cylinder rod. Again, a sound (click) can be heard as the advance lever (pawl) engages the next gear tooth. The red mark can be seen in rear opening (10). Do the cycle until the fastener is loosened enough to be removed by a faster method. The socket is moved 40° each time the cylinder is cycled.
4 Examples of other positions to loosen fasteners are shown above.
5 To tighten a fastener, find the correct torque for the thread size of the fastener. Put a 25.4 (1.0") drive socket (3) of correct size on the fastener. Put hydraulic wrench (2) in position (see Step 1) with reaction bar (4) against a solid surface as shown and adjust driver (5) to fit socket (3). The hydraulic wrench should be kept as nearly parallel to the fastened surface as possible. Connect hydraulic hoses (6) from the hydraulic pump to the hydraulic wrench.
6 If the hydraulic pump has an outside pressure regulator (see Step 3), set the regulator so the pressure will be limited to the desired torque (see the torque/pressure conversion chart). Use the cycle procedure in Step 3 until the fastener is at the desired torque (preset pressure).
NOTE: If the hydraulic wrench cannot be removed, put a slight additional torque to the fastener and then retract the cylinder rod. This will release the hydraulic wrench.
7 Examples of other positions to tighten fasteners are shown above.
8 For torque-turn tightening, find the desired primary torque for the fastener. If the hydraulic pump has an outside pressure regulator, set the regulator to 42,880 kPa (6200). Tighten the fastener with the hydraulic wrench until the fastener is at the primary torque. Make a mark on drive sleeve (10) and on wrench frame (11) so the desired degrees of turn can be seen. Operate the hydraulic wrench until the mark on the drive sleeve is in alignment with the mark on the wrench frame. Release the pressure on the hydraulic wrench.
9 For fasteners which the 6V200 Hydraulic Wrench cannot loosen, an impact wrench can be used in connection with the hydraulic wrench to give the necessary force needed to loosen the fastener. In this procedure, put the hydraulic wrench in position to loosen the fastener. Then put a female to female adapter on the square driver of the hydraulic wrench that will adapt the impact wrench. The two tools together give steady, high torque along with impact torque to loosen the fastener.