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Komatsu Backhoe Hydraulic Cylinder Seal Kits

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Komatsu Backhoe Hydraulic Cylinder Seal Kits parts list
Image Fits Model Description Part # Price Product Details
Backhoe Cylinder Seal Kit for Komatsu WB140-2 - 878000490 See Details WB140-2 Seal Kit, Dipper Arm Cylinder 878000490
$64.00
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Cylinder Seal Kit for Komatsu WB140-2 Backhoe Boom Cylinder - 878000489 See Details WB140-2, WB140PS-2, WB150AWS-2N Backhoe Boom Cylinder 878000489
$68.00
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Backhoe Cylinder Seal Kit for Komatsu WB140-2, Left-Hand Boom Swing Cylinder - 878000542 See Details WB140-2 Seal Kit, Boom Swing Cylinder Left-Hand 878000542
$48.60
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Komatsu Backhoe Cylinder Seal Kit for WB140-2 Boom Swing Cylinder- 707-98-33500 See Details WB140-2 Boom Swing Cylinder 707-98-33500
$68.00
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Komatsu Backhoe Bucket Cylinder Seal Kit for WB146-5 707-99-26530 See Details WB146-5, WB146PS-5 Seal Kit, Backhoe Bucket Cylinder 707-99-26530
$70.02
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Arm Cylinder Seal Kit for Komatsu WB146-5, WB146PS-5 Backhoes - 707-99-35590 See Details WB146-5, WB146PS-5 Seal Kit (Arm Cylinder) 707-99-35590
$64.00
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Telescopic Arm Cylinder Seal Kit for Komatsu WB140PS-2, WB150-2, WB150AWS-2N Backhoe - 878000388 See Details WB140PS-2, WB150-2, WB150AWS-2N Seal Kit, Telescopic Arm Cylinder 878000388
$32.40
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Backhoe Boom Cylinder Seal Kit for Komatsu WB150 See Details WB150-2, WB150PS-2 , WB140PS-2N, WB150AWS-2N Boom Cylinder 878000541
$104.00
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Cylinder Seal Kit for Komatsu WB140PS-2N, WB150AWS-2N Backhoe Arm Cylinder - 878000491 See Details WB140PS-2N, WB150AWS-2N Seal Kit, Dipper Arm Cylinder 878000491
$64.89
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Backhoe Bucket Cylinder Seal Kit for Komatsu WB140PS-2N, WB150-2, WB150AWS-2 See Details WB140PS-2N, WB150-2, WB150AWS-2 (after serial # A40001) , WB140-2N (after serial # A20001) , WB150AWS-2N (after serial # A90001) Seal Kit, Backhoe Bucket Cylinder 827020113
$29.47
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Stabilizer Cylinder Seal Kit for Komatsu WB140-2 Backhoe (Outrigger) See Details WB140-2 Seal Kit, Stabilizer Cylinder 707-98-34460
$58.00
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707-98-25830 Cylinder Seal Kit for Komatsu WB140-2 Backhoe Bucket Cylinder See Details WB140-2 Seal Kit (Backhoe Bucket Cylinder) 707-98-25830
$84.27
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Backhoe Cylinder Seal Kit for Komatsu WB140-2, Boom Cylinder - 707-98-25090 See Details WB140-2 Boom Cylinder 707-98-25090
$78.00
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878000486 Komatsu Backhoe Boom Cylinder Seal Kit for WB140, WB140PS, WB150AWS - 878000486 See Details WB140, WB140PS, WB150AWS Boom Cylinder 878000486
$48.30
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Komatsu Backhoe Cylinder Seal Kit for WB140, WB150 Outriggers - 878000494 See Details WB140-2, WB140PS-2, WB150-2, WB150AWS-2, WB150PS-2 Cylinder Seal Kit 878000494
$38.08
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Komatsu Backhoe Cylinder Seal Kit for WB140, WB150 See Details WB140-2, WB140PS-2, WB150-2N, WB150AWS-2, WB150PS-2 Seal Kit, Backhoe Bucket Cylinder 878000492
$54.00
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See Details WB150AWS-2, WB91R-1/-2, WB93R-1/-2, WB95R-1, WB97R-1/-2, WB97S-2, WB98A-2 Cylinder Seal Kit 855660112
$45.64
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Gasket Kit for Komatsu Wheel Loader See Details WB140-2, WB140PS-2, WB150-2, WB150AWS-2, WB150PS-2, WB91R-2, WB93R-2, WB97R-2, WB97S-2 Gasket Kit 878000487
$50.00
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Komatsu WB140-2N WB150-2 backhoe quick coupler cylinder seal kit 42N-879-1980 See Details WB150AWS-2, WB150-2, WB140PS-2N, WB140-2N (after serial # A20001), WB150AWS-2N (after serial # A40001, 150F80001) Quick Coupler Cylinder Seal Kit 42N-879-1980
$24.00
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Hydraulic cylinder seal kits for Komatsu backhoe loaders, covering boom, arm, bucket, stabilizer, telescopic arm, quick coupler, and swing cylinder applications across the WB140 and WB150 series machines. Kits are matched to specific cylinder positions and serial number ranges for accurate fitment.

Fits Models At A Glance

  • WB140 Series: WB140, WB140-2, WB140-2N, WB140PS, WB140PS-2, WB140PS-2N
  • WB150 Series: WB150, WB150-2, WB150-2N, WB150PS-2, WB150AWS, WB150AWS-2, WB150AWS-2N
  • WB90/WB91/WB93/WB95/WB97/WB98 Series: WB91R-1/-2, WB93R-1/-2, WB95R-1, WB97R-1/-2, WB97S-2, WB98A-2
  • WB146 Series: WB146-5, WB146PS-5

Key Notes

  • Cylinder Types Covered: Boom, arm, bucket, stabilizer/outrigger, telescopic arm, quick coupler, and boom swing cylinders
  • Serial Number Restrictions: Several WB140-2N and WB150AWS-2 kits apply only after specific serial number breakpoints — confirm before ordering
  • Wheel Loader Crossover: Some gasket and cylinder seal kits listed here also fit Komatsu WB-series wheel loader configurations
  • Left/Right Specificity: Boom swing cylinder kits are side-specific; verify left-hand vs. right-hand application before ordering

Why Choose Broken Tractor

  • ✅ Broad WB-series coverage across multiple generations
  • ✅ Detailed fitment data including serial number breakpoints
  • ✅ Fast shipping from Baton Rouge, LA and Kimbolton, OH

Frequently Asked Questions

What hydraulic cylinder seal kits fit a Komatsu WB140-2 backhoe?

Broken Tractor carries seal kits for the WB140-2 boom, bucket, stabilizer (outrigger), and boom swing cylinders. Examples include the 707-98-25090 boom cylinder kit, the 707-98-25830 bucket cylinder kit, the 707-98-34460 stabilizer cylinder kit, and the 878000542 left-hand boom swing cylinder kit. Match the kit to the cylinder position on your machine before ordering.

Does serial number matter when ordering a seal kit for a Komatsu WB140-2N or WB150AWS-2N?

Yes, some kits only fit after specific serial number breakpoints. The 42N-879-1980 quick coupler cylinder seal kit fits the WB140-2N after serial number A20001 and the WB150AWS-2N after serial numbers A40001 and 150F80001. The 827020113 bucket cylinder seal kit fits the WB140-2N after A20001 and the WB150AWS-2N after A90001. If you are unsure where your machine falls, call (800) 909-7060 with your serial number before ordering.

Are Komatsu backhoe boom swing cylinder seal kits side-specific?

Yes, boom swing cylinder kits are made for either the left-hand or right-hand cylinder. The 878000542 kit is for the left-hand boom swing cylinder on the Komatsu WB140-2. We also offer the 707-98-33500 boom swing cylinder kit for the WB140-2. Verify which side you are rebuilding before you order.

Which cylinder seal kits fit a Komatsu WB146-5 backhoe?

We carry the 707-99-26530 bucket cylinder seal kit and the 707-99-35590 arm cylinder seal kit for the Komatsu WB146-5. Both kits also fit the WB146PS-5. Confirm whether you are working on the bucket or arm cylinder so you get the correct kit.

Is there a telescopic arm cylinder seal kit for the Komatsu WB150-2 backhoe?

Yes, the 878000388 telescopic arm cylinder seal kit fits the Komatsu WB150-2, WB140PS-2, and WB150AWS-2N. For the WB150-2 we also offer the 878000541 boom cylinder kit, the 827020113 bucket cylinder kit, and the 42N-879-1980 quick coupler cylinder kit. Match the part number to your cylinder position and model before ordering.

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Product: Category: Komatsu Backhoe Hydraulic Cylinder Seal Kits Brand: Head Title: Komatsu Backhoe Cylinder Seal Kits | Broken Tractor