| № | Number | Name | Qty |
| 708-2H-00027 | PUMP ASS'Y | 1 | |
| 708-2H-00026 | PUMP ASS'Y | 1 | |
| THESE ASSEMBLIES CONSIST OF ALL PARTS SHOWN IN FIGS.Y1600-01A0 TO Y1600-11A0. | |||
| 1 | 702-21-57600 | • PILOT VALVE | 1 |
| 2 | 723-11-19960 | •• O-RING | 1 |
| 3 | 702-21-54910 | •• O-RING | 2 |
| 4 | 702-21-57500 | • PILOT VALVE | 1 |
| 702-21-55701 | • PILOT VALVE | 1 | |
| 5 | 20Y-62-22790 | • BAND, RED | 1 |
| 6 | 01252-60635 | • BOLT | 2 |
| 7 | 723-11-19960 | •• O-RING | 1 |
| 8 | 702-21-54910 | •• O-RING | 2 |
| 9 | 702-16-55260 | • BOLT | 2 |
| 10 | 20Y-62-22830 | • BAND, WHITE | 1 |
| 702-21-55400 | • VALVE ASS'Y | 1 | |
| 11 | 702-21-55920 | •• PLUG | 1 |
| 12 | 702-21-55930 | •• PISTON | 1 |
| 13 | 702-21-55940 | •• SPRING | 1 |
| 14 | 702-21-55951 | •• BLOCK | 1 |
| 15 | 07002-12034 | •• O-RING | 1 |
| 16 | 07000-11008 | • O-RING | 2 |
| 17 | 722-12-18240 | • O-RING | 1 |
| 18 | 01252-60530 | • BOLT | 1 |
| 19 | 708-2H-15531 | • PLUG | 2 |
| 20 | 07000-B1008 | • O-RING | 2 |
| 21 | 07001-01008 | • RING | 4 |
| 22 | 07002-61423 | • O-RING | 2 |
| 23 | 01643-51232 | • WASHER | 2 |
| 24 | 01010-81220 | • BOLT | 2 |
| 25 | 08193-21012 | • CLIP | 2 |
| OEM Part Numbers | 702-21-57500 / 7022157500 & 702-21-55701 / 7022155701 |
| Brand | COGENG (Premium Aftermarket) |
| Valve Type | Hydraulic Pilot Control Solenoid Valve Set |
| Compatible Models | Komatsu PC400-7, PC400-8, PC450-7, PC450-8 Excavators |
| Common Application | Main Control Valve Pilot Circuit / Pump Control |
| Key Benefit | Restores precise hydraulic response and full digging power |
Q: Why replace both 702-21-57500 and 702-21-55701 valves together on a PC400?
A: These two solenoid valves often work in tandem within the PC400's pilot control or pump regulation system. If one has failed due to contamination or wear, the other is likely operating at reduced efficiency. Replacing them as a matched set ensures balanced hydraulic performance and prevents uneven implement response.
Q: What symptoms indicate these PC400 solenoid valves need replacement?
A: Common signs include slow or weak hydraulic response, certain functions (boom/arm/bucket) lagging behind others, intermittent loss of power, or active fault codes related to pump proportional valve or pilot pressure.
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