| Parameter | Specification | Testing Standard |
|---|---|---|
| COGENG Part Number | COGENG-707-98-34460-OTG | Internal Quality Standard QS-520 |
| Replaces OEM Part No. | Komatsu 707-98-34460 | Direct OEM Replacement |
| Rod Diameter | 55 mm | +0.00/-0.05 mm |
| Bore Diameter | 110 mm | +0.10/-0.00 mm |
| Piston Seal Material | Polyurethane (PU) Grade 94A | ISO 6072 |
| Rod Seal Material | Nitrile (NBR) with PTFE fill | ISO 6072 |
| Wiper Material | Polyurethane double-lipped | ISO 6194 |
| O-Ring Material | Nitrile (NBR) 70 Durometer | ISO 3601-1 |
| Wear Band Material | PTFE-filled composite | ISO 6811 |
| Temperature Range | -35°C to +100°C (-31°F to +212°F) | ISO 2230 |
| Pressure Rating | Up to 28 MPa (4060 PSI) | ISO 10766-1 |
| Fluid Compatibility | Komatsu Super Hydraulic Fluid, mineral oil, synthetic | ISO 6743-4 |
| Shelf Life | 5 years in original packaging | ISO 2230 |
| Component | Material | Size Specification | Quantity | Function |
|---|---|---|---|---|
| Main Piston Seal | Polyurethane | 110mm ID x 8mm width | 1 | Primary pressure sealing |
| Rod Seal | NBR with PTFE | 55mm ID x 6mm width | 1 | Dynamic rod sealing |
| Buffer Seal | Polyurethane | 110mm ID x 6mm width | 1 | Pressure peak protection |
| Wiper Seal | Polyurethane double-lipped | 55.5mm ID | 1 | Contaminant exclusion |
| Wear Bands | PTFE composite | 110mm OD x 6mm width | 2 | Piston guidance |
| O-Rings | Nitrile (NBR) | Various sizes AS568 | 6 | Static sealing |
| Backup Rings | Nylon 6.6 | Various sizes | 3 | Anti-extrusion support |
| Guide Rings | PTFE-filled fabric | 110mm OD x 6mm width | 2 | Bearing surface protection |
| Gland Gasket | NBR | 60mm OD x 2.5mm CS | 1 | Gland static seal |
| Manufacturer | Model Series | Specific Models | Year Range | Application |
|---|---|---|---|---|
| Komatsu | WB140 | WB140-2, WB140-2N | 1998-2003 | Front/Rear Outriggers |
| Komatsu | WB140 | WB140-3, WB140-3N | 1999-2004 | Stabilizer Cylinders |
| Komatsu | WB140 | WB140-5, WB140-5E | 2000-2005 | Leveling Jacks |
| Related Models | WB Series | WB130, WB150 | 1997-2002 | Verify compatibility |
| Parameter | Specification | Tolerance | Application |
|---|---|---|---|
| Cylinder Bore | 110 mm | +0.10/-0.00 mm | Outrigger cylinder |
| Piston Rod Diameter | 55 mm | +0.00/-0.05 mm | Chrome-plated rod |
| Stroke Length | 480 mm | ±3 mm | Outrigger extension |
| Rod Finish | Hard chrome plated | Ra 0.2-0.4 μm | Surface roughness |
| Operating Pressure | 24.5 MPa (250 kg/cm²) | ±2% | System design pressure |
| Holding Capacity | 8,000 kg per outrigger | ±5% | Maximum stabilizer load |
| NO | Number | Name | Qty |
| KIT | 707-98-34460 | SERVICE KIT, OUTRIGGER | 1 |
| CYL | 721-00-11550 | CYLINDER ASSY, OUTRIGGER, R.H. | 1 |
| 721-11-11871 | • CYLINDER, R.H. | 1 | |
| 2 | 707-76-45590 | • BUSHING | 2 |
| 3 | 707-40-45020 | • SPACER | 1 |
| 4 | 707-29-11730 | • HEAD, CYLINDER | 1 |
| 5 | 07177-05530 | • BUSHING | 1 |
| 6 | 707-51-55211 | • PACKING, ROD (KIT) | 1 |
| 7 | 707-56-55510 | • SEAL, DUST (KIT) | 1 |
| 8 | 07179-12069 | • RING, SNAP | 1 |
| 9 | 07000-12105 | • O-RING (KIT) | 1 |
| 10 | 07146-02106 | • RING, BACK-UP (KIT) | 1 |
| 11 | 07000-12110 | • O-RING (KIT) | 1 |
| 12 | 707-58-55500 | • ROD, PISTON | 1 |
| 13 | 707-76-45560 | • BUSHING | 1 |
| 14 | 707-36-11980 | • PISTON | 1 |
| 15 | 707-44-11180 | • RING, PISTON (KIT) | 1 |
| 16 | 07156-01112 | • RING, WEAR (KIT) | 1 |
| 17 | 07000-12055 | • O-RING (KIT) | 1 |
| 18 | 07001-02055 | • RING, BACK-UP (KIT) | 2 |
| 19 | 707-71-70740 | • PLUNGER | 1 |
| 20 | 04260-00635 | • BALL | 11 |
| 21 | 707-71-91290 | • PLUG | 1 |
| 22 | 01310-00820 | • SCREW | 1 |
Preventive Maintenance Schedule:
Visual inspection every 250 operating hours
External leakage check monthly
Cylinder performance monitoring during operation
Hydraulic fluid cleanliness maintenance
Complete cylinder inspection every 1,500 hours
Troubleshooting Guide:
External Leakage: Check seal installation and rod surface condition
Outrigger Drift: Verify piston seal integrity and check for internal leakage
Slow Operation: Check for contamination or air in hydraulic system
Weak Holding Power: Verify system pressure and check for seal damage
Jerky Movement: Inspect for damaged wear bands or guide rings
Q1: Which Komatsu WB140 models use the 707-98-34460 outrigger boom swing LH seal kit?
A: This seal kit is designed for the left-hand (LH) outrigger boom swing cylinder on specific Komatsu WB140 backhoe loader models requiring OEM part number 707-98-34460. Please verify compatibility with your machine serial number before ordering.
Q2: What does "LH" (Left-Hand) mean for this seal kit?
A: LH indicates this seal kit is specifically for the left-hand side outrigger boom swing cylinder. Right-hand cylinders may require a different part number. Please confirm your application before purchasing.
Q3: Is this an OEM or aftermarket seal kit?
A: It is an OEM-grade replacement kit, manufactured to meet or exceed original Komatsu quality standards for sealing performance, durability, and precise fit.
Q4: What is included in the COGENG 707-98-34460 seal kit?
A: The kit includes all necessary rod seals, piston seals, wipers, O-rings, and backup rings for a complete outrigger boom swing cylinder rebuild – no missing components.
Q5: How do I purchase the COGENG 707-98-34460 outrigger boom swing LH seal kit?
A: Contact us with your Komatsu WB140 machine serial number and cylinder details for fitment verification, then order directly through our website or sales team for fast shipping
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