Your Whole New Supply Chain For Heavy-Duty Parts
Whatsapp：
+86 18915027366
Phone：
+86 18915027366
702-21-57400
702-21-57400 / 702-21-55600
OE-Equivalent Replacement Quality
IATF 16949 / ISO 9001 / CE / RoHS
50 pcs
7 - 15 Days
12 Months
702-21-57400 / 702-21-55600
Komatsu PC200-7, PC200-8, PC210-8, PC220-7, PC220-8 and related excavators with matching block layout
Confirm voltage, connector, cartridge or flange dimensions, seals and hydraulic circuit before installation.
| Quantity: | |
|---|---|
702-21-57400 is a proportional solenoid valve assembly for Komatsu excavator hydraulic control. The catalog identifies a 12V version and a 41 bar working pressure reference; application sources connect the number to PC200, PC210 and PC220 families. Confirm the complete valve block and machine serial information.
Item | Confirmed Information |
Product Type | Proportional hydraulic solenoid valve block |
OE / Reference Numbers | 702-21-57400 / 702-21-55600 |
Voltage | 12V catalog version |
Application Scope | Komatsu PC200-7, PC200-8, PC210-8, PC220-7, PC220-8 and related excavators with matching block layout |
Electrical Version | 12V catalog version |
Valve Function | Proportional hydraulic control |
Maximum Working Pressure | 41 bar |
Filtration | 25 micrometres or better |
Operating Temperature | -40 to +120 degrees Celsius |
Cross Reference | 702-21-55600 appears in external listings |
MOQ | 50 pcs |
Delivery Time | 7 - 15 Days |
Warranty | 12 Months |
Use the 702-21-57400 technical image to confirm block dimensions, port positions and proportional circuit details before matching a PC200, PC210 or PC220 machine.
Release the proportional block from the 702-21-57400 reference group, 12V control, 41 bar duty, port layout, connector set and Komatsu serial record.
Approval Point | Buyer Review |
Reference Control | 702-21-57400 / 702-21-55600 |
Electrical Control | 12V catalog version; verify at the connector under command |
Mechanical Fit | Compare thread or flange, cartridge length, sealing lands and installed clearance |
Functional Control | Confirm normal state, energized state and hydraulic port relationship |
Application Evidence | Komatsu PC200-7, PC200-8, PC210-8, PC220-7, PC220-8 and related excavators with matching block layout |
Uneven proportional response requires comparison of command current, coil behavior, pilot pressure, spool freedom and oil cleanliness across the operating range.
Observed Situation | Recommended Check |
No hydraulic response | Check command voltage, connector, coil and whether the cartridge moves. |
Slow response | Review oil cleanliness, filter condition, viscosity and connector voltage under load. |
Reversed response | Compare normal and energized circuit states with the machine schematic. |
External leakage | Inspect seals, cartridge surface, bore condition and seating depth. |
Repeated coil heating | Check voltage, resistance, duty cycle, contamination and incomplete spool movement. |
Approval Item | Required Information |
Old Part Evidence | Complete label, connector face, mounting or cartridge side and one installed view |
Machine Evidence | Komatsu PC200-7, PC200-8, PC210-8, PC220-7, PC220-8 and related excavators with matching block layout |
Measurements | Thread or flange, cartridge length, seals and installed clearance |
Electrical Evidence | 12V catalog version; measured under the actual command |
Commercial Evidence | Quantity, destination, packing, labeling and inspection requirements |
Keep both references on the comparison when they appear in the machine or supplier record, then verify the complete block layout, connector arrangement, mounting points and hydraulic ports against the removed 702-21-57400 unit. A cross reference begins technical review but does not prove that every PC200, PC210 or PC220 serial range uses an identical configuration.
The listed valve block uses a 12V electrical version and a 41 bar maximum working pressure. Confirm both against the removed assembly and machine circuit. A higher-pressure cartridge specification from another product family should not be transferred to the pilot block. Voltage, pressure duty and proportional function must agree before installation.
A proportional valve responds to a variable command rather than only switching fully on or off. Measure command current or the specified control signal across the operating range and compare it with machine response. Abrupt, weak or unstable movement can result from signal, coil, spool or pilot-pressure problems, so simple continuity testing is not enough.
Compare mounting-hole pattern, port positions, connector count, coil orientation, body dimensions and surrounding hose clearance. Record the Komatsu model and complete serial number. Similar excavator families can use revised hydraulic blocks, so the machine name supports selection only after the removed assembly confirms the same physical and functional arrangement.
Monitor the command signal and coil current while checking pilot pressure, oil cleanliness and spool movement. Maintain filtration at 25 micrometres or better. A stable electrical command with poor hydraulic response points toward contamination or pressure conditions, while an unstable current trace suggests wiring, controller or coil problems. Evaluate both sides before replacement.
Retain reference markings, 12V confirmation, 41 bar duty, machine serial number, block dimensions, connector and port photographs, and the approved response test. Incoming inspection should compare those fixed characteristics by lot. Keeping one configuration package for each Komatsu serial group prevents a revised block from being accepted only because the main reference looks familiar.
Send both reference numbers, Komatsu model and serial number, 12V confirmation, block and connector photographs, port layout, quantity and delivery needs.
