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KPM RCVD8C Series Instruction Manual

Pilot valve
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JOB NO.
COPY
NOTE
1.DRAWN
DATE : 2004.11.30
控
SU
FILING NO.
M
00115869-1_RCVD8C_manual.doc
RETURN TO INDEX
PILOT VALVE
RCVD8C SERIES
INSTRUCTION MANUAL
(02360-8776,02360-8928)
APPROVED
REVIEWED
CHECKED
DRAWN
DRAWING NO.00115869
PAGES）
（TOTAL

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Summary of Contents for KPM RCVD8C Series

  • Page 1 RETURN TO INDEX PILOT VALVE RCVD8C SERIES INSTRUCTION MANUAL JOB NO. COPY NOTE 1.DRAWN (02360-8776,02360-8928) APPROVED REVIEWED CHECKED DRAWN DATE : 2004.11.30 控 DRAWING NO.00115869 FILING NO. 00115869-1_RCVD8C_manual.doc PAGES） （TOTAL...

  • Page 2: Table Of Contents

    Contents Chapter 1 Safety information --------------------------------------- Page 1 Chapter 2 Overview ----------------------------------------------- Page 5 Chapter 3 Specifications --------------------------------------- Page 5 Chapter 4 Operation ----------------------------------------------- Page 6 Chapter 5 Maintenance ----------------------------------------------- Page 10 Chapter 6 Troubleshooting and corrective measures --------------- Page 30 Pilot valve cross-section --------------------------------------- Page 31...

  • Page 3: Chapter 1 Safety Information

    Chapter 1 Safety information 1. About this operation manual To operate this equipment safely and correctly, read this manual carefully and understand it thoroughly before handling and operating the equipment. Specifically, be sure to read "Safety precautions" for correct use of this equipment. Always keep this manual accessible in a safe place.
  • Page 4 2.1 Precautions in operating the equipment Pay attention to the following points when you operate this equipment. Warning (1) Before starting this equipment, carefully check if there is no one or no obstacle within the danger zone near the operating range of the equipment. (2) If you find the equipment operating in a dangerous condition, urgently turn off the pressure source.
  • Page 5 Caution (1) Before starting operation, be sure to turn off the power to the equipment and verify that motors and engines, etc have been stopped. Also, verify that the pressure inside the hydraulic piping is zero (0). To release remaining pressure from inside the accumulator circuit, operate the lever of the equipment several times (at least 10 times).
  • Page 6 2.5 Precautions relating to performance and functions Caution Since this product is critical safety equipment, we can guarantee the performance and functions of only those products that have passed our outgoing performance and operation inspection. Take this fact into account before starting disassembling/reassembling the product. 3 Exemption from responsibility Be aware that we are not responsible for the following.

  • Page 7: Chapter 2 Overview

    Chapter 2 Overview damper-embedded pilot valve, RCVD8C, reducing-type valve using secondary-pressure-controlling reducing valves contained in a single valve casing. The outlet pressure varies according to the angle of the operating section. The RCVD8C also includes a damping mechanism coupled to the valve casing, a mechanism which prevents hunting (lever-hunting) in the man-machine system.

  • Page 8: Chapter 4 Operation

    Chapter 4 Operation The damper-embedded pilot valve includes in its main body a damping function to prevent hunting (lever hunting) in the man-machine system. The following explains the operation of the damper-embedded pilot valve, separating it into 2 sections: "a. reducing valve" and "b. operation section damping mechanism" based on the hydraulic circuit diagram below, the assembly cross-section drawing in 31(RCVD8C), 32(RCVD8CC), and the...
  • Page 9 As shown in the assembly cross-section drawing, when the cam (420) is rotated clockwise, the push rod (214) at the port 1 is pressed downward, which pushed the spool downward with the help of the washer 1, the spring seat, the secondary-pressure-setting spring (324), the washer 2 (217), and the washer 3 (313).
  • Page 10 and the damping spring. As in the case above, the oil in the tank room is absorbed into the damping piston chamber through the 3 ball check valve portions (using the ball (225) and the bush (223)). The oil outside the piston chamber flows through the path that joins to the tank port from the casing top.

  • Page 12: Chapter 5 Maintenance

    Chapter 5 Maintenance Special jig for disassembling/reassembling (1) Special jig 1 (for removing and pressing the bush) Center hole allowed (φ2 or less) (2) Special jig 2 (for fitting the locking ring)
  • Page 13 Disassembling instructions Operational precautions in general (1) Prepare a solid and rattle-free working bench that is wide enough to place parts on and that does not allow the parts to drop or move. (2) Prepare tools and materials. (3) Since the parts are very precise, handle them with much care not to bump them each other or drop them.
  • Page 14 Work Photo or Figure Unscrew the Allen screw (522) with an Allen wrench. Remove the pedal (520). Unscrew the Allen screw (473) with an Allen wrench. Remove the block (431). Remove the bellows (501) from the cover (201) by pulling the bellows upward. Loosen the setscrew (423) with an Allen wrench.
  • Page 15 Work Photo or Figure Putting a round bar (φ8 or less) on one end of the cam axis (413), tap the bar gently with a hammer to pull out the axis. Remove the cam (420) as an assembly with the setscrew (471) and lock nut (472) attached.
  • Page 16 Work Photo or Figure Pull out the push rod from the plug. Note down the positional relationship between the plug and the push rod. Take care not to scratch the push rod surface. Be careful because the plug may be pushed out while the push rod is removed.
  • Page 17 Work Photo or Figure Remove the spring seat (218) from the casing. Note down the positional relationship between the spring seat and the hole in the casing. Remove the steel ball (225) using a device, such as a magnet. Take care not to lose the steel ball. Remove the locking ring (221) from the casing using pliers.
  • Page 18 Work Photo or Figure Remove the reducing valve section assembly and the return spring (335) from the casing. Note down the positional relationship with the casing hole. Place the cover (201) with its side downward on a flat table. Putting the special tool 1 on the bush (412), tap the tool with a hammer to pull out the bush.
  • Page 19 Work Photo or Figure To dismantle the reducing valve section assembly, stand upright the spool (301) bottom end on a flat work bench, push down the spring seat (311) then remove 2 semicircular washers 1 (215) using a small flat-head screwdriver tip. Take care not to scratch the spool surface.
  • Page 20 Work Photo or Figure Remove the O-ring (212) from the plug. Fix the Casing (101) on a vice using cushion sheets. Unscrew the Plug (153) with an Allen wrench. (RCVD8CC only) Pull out the Seat (191) from the Casing (101). (RCVD8CC only) Remove the Steel ball (192) from the Casing (101).
  • Page 21 Work Photo or Figure Cleaning the parts 1) Put the parts into the kerosene contained in a rough-cleaning container, and clean them. (Rough-cleaning) If the parts are washed immediately after put into the kerosene, they are easily scratched. Wait until contaminations and oily substances are detached and floated on the surface of the kerosene.
  • Page 22 Assembling instructions Operational precautions in general (1) As done for disassembling, prepare a working bench and tools. (2) Pay attention as done for disassembling. (3) Before assembling, remove bits of metal or foreign material from all the parts, and also check that there is no burrs or dents on the parts.
  • Page 23 Work Photo or Figure Tighten the Plug (153) with the torque specified. (RCVD8CC only) Attach the washer 3 (313), the washer 2 (217), the secondary-pressure-setting spring (324), and the spring seat (311) to the spool (301) in this order. The washer 2, whose thickness varies depending on the spool assembly, is for adjustment to preset the secondary-pressure-setting spring.
  • Page 24 Work Photo or Figure Install the return spring (335) into the casing. Install it at the previous position before it was disassembled. Install the reducing valve section subassembly, assembled in 1 and 2 above, into the casing. Install it at the previous position before it was disassembled.
  • Page 25 Work Photo or Figure Tentatively set the locking ring (221) in the casing hole using pliers. Set the locking ring where it was before the disassembly. Set the locking ring horizontally. Take care not to damage the casing inside surface. Turn the locking ring sharp edge upward.
  • Page 26 Work Photo or Figure Install the damping spring (336) in the casing. Install it at the previous position before it was disassembled. Install the damping spring (337) in the casing. Install it at the previous position before it was disassembled. Take care so the damping spring (337) does not interfere with the damping spring (336).
  • Page 27 Work Photo or Figure Install the NHU packing (210) into the plug. When you install the NHU packing, pay attention to its direction. (Refer to the following figure.) Apply a thin film of grease to the NHU packing before installing it. NHU packing Install the grease cup (203) into the plug.
  • Page 28 Work Photo or Figure Press the bush (412) to the cover (201) using special tool 1 then lightly tap to press it in with a hammer. Be careful because the end of the bush comes out of the cover. Install the cover into the casing. Install it at the previous position before it was disassembled.
  • Page 29 Work Photo or Figure Install the cam (420) into the cover. Install it at the previous position before it was disassembled. Holding down the cam (420), insert the cam shaft (413) from outside. Apply Loctite #241 or equivalent to the surface of the setscrew (423).
  • Page 30 Work Photo or Figure Adjust the setscrew (471) height so the cam (420) top surface can be parallel with the cover bottom surface, rotate the cam to the right and left to check that it can be in a neutral position without backlash, and then tighten the lock nut (472) with the specified torque.
  • Page 31 Work Photo or Figure Install the block (431) and tighten the Allen screw (473) with the torque specified. Install the pedal (520) and tighten the Allen screw (522) with the torque specified. Attach the pedal cover (521)

  • Page 32: Chapter 6 Troubleshooting And Corrective Measures

    Chapter 6 Troubleshooting and corrective measures Troubleshooting is not easy. Some assumed causes are listed in the table below. Since repair is difficult, refer to the assumed causes and corrective measures in the table. Symptoms, assumed causes, and corrective measures in general are listed in the table below. In most cases, a trouble is not caused by a failure only with a single part, but caused by a failure involving more than one part.