OPERATION CHASSIS (continued) 2-91 WA420-3MC Problem Main causes Remedy HYDRAULIC SYSTEM Lack of lifting power for bucket Bucket takes time to raise Lack of oil Clogged hydraulic tank filter Add oil to specified level. See “24.6 EVERY 100 HOURS SERVICE” on page 3-45. Replace filter. See “24.10.2 CHANGE OIL IN HYD TANK, REPLACE FILTER ELEMENT” on page 3-68. Excessive bubbles in oil Low quality oil being used Oil level is low Air in oil line Replace with good quality oil Add oil to specified level. See “24.6 EVERY 100 HOURS SERVICE” on page 3-45. Bleed air. Hydraulic pressure is low Oil level is low and pump is sucking in air Add oil to specified level.
See “24.6 EVERY 100 HOURS SERVICE” on page 3-45. Then bleed air. Movement of cylinder is irregular Oil level is low Add oil to specified level. See “24.6 EVERY 100 HOURS SERVICE” on page 3-45.