Table of Contents
Section 1: Assembly and
Land Pride
boom, the power crowd side of the dipper stick, and both sides of the swing. If the circuit relief is faulty, it could be caused by dirt. This could be rectified by removing and cleaning the circuit relief. See instructions for Circuit Relief Valve.
Checking the Cylinders
Take a reading at idle speed, with cylinder at end of stoke. Next take another reading at high speed. If the pressure increases with speed, it would indicate a faulty cylinder.
Return Hose:
If the return hose bursts, check to see if the high- pressure line is connected to pressure port of the backhoe, or if the return hose is restricted (usually by an oil coupler).
Testing Closed Center System
On a closed center system the gauge will read the same as the tractor’s system pressure rating. (e.i. older Closed Center John Deere’s will read 2200 to 2250 PSI)
Checking a Single Circuit
If there is a loss of power on one circuit, it may be checked by actuating the valve. The pressure should drop until the end of cylinder stroke, if the pressure does
not return to the original reading, this would indicate a faulty cylinder or circuit relief. Circuit reliefs are on the down stroke of the boom, the power crowd side of the dipper stick, and both sides of the swing. If the circuit relief is faulty, it could be caused by dirt. This could be rectified by removing and cleaning the circuit relief.
Checking the Pump
If the tractor’s PSI is rated at 2250 lbs, and the gauge reads less, the tractor’s hydraulic system is faulty or the backhoe’s valve is improperly set for closed center operation. See Closed Center Hydraulic System Section.
Checking The Cylinders
Take a pressure reading at idle speed, with cylinder at end of stoke. Next take another pressure reading at high speed. If the pressure increases with speed it would indicate a faulty cylinder.
For other hydraulic problems refer to Troubleshooting Section.
Before calling your dealer, fill in the Hydraulic Testing Chart below. The chart below will enable the service man to diagnose nearly
Hydraulic Testing Chart
Cylinder Function* | PSI Idle Speed | PSI Full Speed |
Stabilizer - Up R.H.
Stabilizer - Down R.H.
Stabilizer - Up L.H.
Stabilizer - Down R.H.
Dipper Stick - In
Dipper Stick - Out
Swing - Left
Swing - Right
Bucket - Open
Bucket - Closed
Boom - Up
Boom - Down
* Reder to Figure
12 BH3512 Backhoes | 7/14/08 |
