What Causes Weak Crawling in Excavators?

[LeDallas]

Excavator weakness may be caused by central oil seal leakage leading to pressure loss, or damage to the oil distribution plate. Here are more relevant details: 1. Swing joint leakage: The primary reason for weak crawling is severe leakage in the swing joint. Hydraulic oil must pass through the swing joint to travel from the upper part of the excavator to the lower walking device. If the swing joint leaks or is damaged, some high-pressure oil will flow into the return pipe, resulting in weak crawling and affecting the normal operation of the excavator. Therefore, it is necessary to inspect it to determine if the fault is caused by leakage. 2. Various valve failures: Inspection of control valves is also an essential step. Any malfunction in safety valves, throttle valves, check valves, balance valves, overflow valves, or walking reversing valves can potentially cause crawling issues in excavators. Control valve failures include stuck walking control valve spools, short travel, excessive clearance between the spool and valve bore, and reduced safety valve pressure, all of which can lead to weak right-side crawling.