In the daily maintenance of wreckers, the multi-way valve maintenance of wreckers is particularly important and is the core component of operation. The role of multi-directional valve of wrecker is to use the change of the relative position between valve body and valve body to control. The direction of flow of the oil at night switches the oil circuit on or off, thus changing the operating state of the hydraulic system. Therefore, the multiple directional valves of the wrecker usually need more maintenance and maintenance to ensure that it can be put into operation normally.
maintenance
A. Unscrew the relief valve with a 30 opening or box wrench.
B, block the mouth with a clean gauze to prevent oil spills.
C. Clean out the debris from the arrow. With the cross from the top of the pressure point pointed by the tip (inner valve core), back and forth several times, and add a little hydraulic oil, until the impurities discharged from the hole, then use the mouth to blow the end, should not leak.
The pressure of the multi-way reversing valve of the wrecker is between 15 and 18, which is a normal value. If it is too high or too low, large screws need to be adjusted to reach the standard pressure. The multi-directional shuttle valve of the wrecker needs frequent cleaning and can be cleaned with gasoline, special cleaning agent or high-pressure gas.
Wrecker (2). Failure of multi-way manual reversing valve:
A. Internal and external leaks caused by defects in castings and forgings.
B. Breakage, aging of the seals on the end caps of the valve body, breakage of the seals of the multi-piece valve plate and the joint part of the splitting plate, and leakage due to aging.
C. The inflexible linkage mechanism of the cylinder, the uncleanness of the oil causes the valve core and the valve body to form scratches and burrs. The looseness of the mounting screw of the valve body cover and looseness cause the relative movement of the valve core to be incorrect, resulting in a valve. Core jam or stroke is not in place.
D. Spool, valve body due to foreign matter, dirt formed a serious pull flowers, scratches caused by the seal gap is too large to cause internal leakage.
E. Relief valve failure.
Wrecker (3). Faulty on-site maintenance of multi-way manual reversing valve:
(1). Poppet stuck and stroke not in place:
A. Clean the valve plug and valve body. Check valve core, valve body surface finish.
B. Check the linkage mechanism.
C. Check if the body cover screws are loose and centered.
D. In practice, the deformation of the valve body due to thermal expansion and contraction may also occur, resulting in a change in the clearance between the valve body and the valve body.
1. Apply the grinding sand directly to the valve body or valve body to make it flexible.
2. Use the lathe to rotate at a low speed to grind the valve core with fine sandpaper or water sandpaper. The amount of grinding is controlled within -4 to -8 seconds of the original spool size. Note that the measuring tool for grinding must be a micrometer instead of a vernier caliper.
3. Dimensions of the clearance between the valve body and the valve body:
The small diameter is 6 to 10 seconds, and the large diameter is 8 to 16 seconds. 1 mm = 100 silk = 1000 seconds.
E. Deformation of the connecting rod connecting the valve plug and the operating rod, and the ball joint at the connection between the connecting rod and the valve plug is seriously worn and causes a gap.
maintenance
A. Unscrew the relief valve with a 30 opening or box wrench.
B, block the mouth with a clean gauze to prevent oil spills.
C. Clean out the debris from the arrow. With the cross from the top of the pressure point pointed by the tip (inner valve core), back and forth several times, and add a little hydraulic oil, until the impurities discharged from the hole, then use the mouth to blow the end, should not leak.
The pressure of the multi-way reversing valve of the wrecker is between 15 and 18, which is a normal value. If it is too high or too low, large screws need to be adjusted to reach the standard pressure. The multi-directional shuttle valve of the wrecker needs frequent cleaning and can be cleaned with gasoline, special cleaning agent or high-pressure gas.
Wrecker (2). Failure of multi-way manual reversing valve:
A. Internal and external leaks caused by defects in castings and forgings.
B. Breakage, aging of the seals on the end caps of the valve body, breakage of the seals of the multi-piece valve plate and the joint part of the splitting plate, and leakage due to aging.
C. The inflexible linkage mechanism of the cylinder, the uncleanness of the oil causes the valve core and the valve body to form scratches and burrs. The looseness of the mounting screw of the valve body cover and looseness cause the relative movement of the valve core to be incorrect, resulting in a valve. Core jam or stroke is not in place.
D. Spool, valve body due to foreign matter, dirt formed a serious pull flowers, scratches caused by the seal gap is too large to cause internal leakage.
E. Relief valve failure.
Wrecker (3). Faulty on-site maintenance of multi-way manual reversing valve:
(1). Poppet stuck and stroke not in place:
A. Clean the valve plug and valve body. Check valve core, valve body surface finish.
B. Check the linkage mechanism.
C. Check if the body cover screws are loose and centered.
D. In practice, the deformation of the valve body due to thermal expansion and contraction may also occur, resulting in a change in the clearance between the valve body and the valve body.
1. Apply the grinding sand directly to the valve body or valve body to make it flexible.
2. Use the lathe to rotate at a low speed to grind the valve core with fine sandpaper or water sandpaper. The amount of grinding is controlled within -4 to -8 seconds of the original spool size. Note that the measuring tool for grinding must be a micrometer instead of a vernier caliper.
3. Dimensions of the clearance between the valve body and the valve body:
The small diameter is 6 to 10 seconds, and the large diameter is 8 to 16 seconds. 1 mm = 100 silk = 1000 seconds.
E. Deformation of the connecting rod connecting the valve plug and the operating rod, and the ball joint at the connection between the connecting rod and the valve plug is seriously worn and causes a gap.
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