Bucket Positioner Master Cylinder for Caterpillar 920, 930 Loaders | 5V9151

Fits Models At A Glance:

• Caterpillar Wheel Loaders: 920, 930, 930R, 930T

Key Notes:

• Part Number: 5V9151 (Caterpillar reference 5V-9151)
• Position: Bucket Positioner and Indicator Circuit, Master Cylinder
• Function: Converts control lever movement into hydraulic pressure by displacing fluid in the cylinder bore, driving the bucket positioner and indicator
• Dimensions: 109.5 mm long
• Stroke: 31.7 mm
• Material: Carbon steel
• Weight: 3.6 lbs.
• Condition: Aftermarket replacement part
• Application: Replaces the bucket positioner and indicator master cylinder on Caterpillar 920, 930, 930R and 930T wheel loaders
• Shipping Restrictions: Ships to the lower 48 US states only
• Note: Cylinder only - linkage, lines, fluid, seals and mounting hardware are not included. This is not a brake component. The Costex catalog lists no serial number breaks for this part; compare the cylinder you are removing before ordering.

Common Use Case or Symptoms:

Fit this when the bucket will no longer return to a set dig position on its own, or the indicator stops tracking the bucket angle - once the positioner loses pressure the operator is levelling the bucket by eye on every pass, and cycle times go with it.

Why Choose Broken Tractor?

• ✅ Positioner Not Brakes: This cylinder drives the bucket positioner and indicator circuit, which is a different system from the loader brakes despite where some catalogs file it.
• ✅ Stroke And Length Published: 109.5 mm long with a 31.7 mm stroke, which is what identifies this cylinder against the others on a 920 or 930.
• ✅ Automatic Kickout Restored: The positioner is what lets an operator load truck after truck without resetting the bucket by hand each time.