Komatsu D31EX-21, Operation & Maintenance Manual, Page: 246 / 256

HANDLING HYDRAULIC RIPPER
ATTACHMENTS, OPTIONS
6-6
TROUBLESHOOTING 6
OTHER TROUBLE 6
q
( ): Always contact your Komatsu distributor when dealing with these items.
q
In cases of abnormalities or causes which are not listed below, contact your Komatsu distributor for repairs.
MAINTENANCE 6
EVERY 250 HOURS SERVICE 6
LUBRICATING
1. Lower the ripper to the ground and stop the engine.
2. Using a grease pump, pump in grease through the grease fittings shown by arrows.
3. After greasing, wipe off any old grease that was pushed out.
(1) Ripper cylinder foot pin (1 point)
(2) Ripper cylinder rod end pin (1 point)
(3) Link pin (2 points)
Problem Main causes Remedy
Slow ripper raising and function,
lack of ripping force. •Improper hydraulic oil
•Defective pump
•Defective adjustment of relief valve
•Defective control valve, safety valve
•Defective valve spool
•Defective piston ring, packing, valve
•Clogging inside piping
•Add oil to specified level, see
CHECK BEFORE STARTING
(•Check, repair)
(•Check, adjust)
(•Check, repair)
•Check, repair)
(•Check, repair)
Cylinder lacks holding power •Leakage of oil from piping, hose
•Defective piston ring, packing
•Defective piston valve
•Defective valve spool
•Defective safety valve, suction valve •Tighten
(•Replace)
(•Check, repair)
(•Check, repair)
(•Check, repair)
Oil pressure does not rise
•Clogging inside piping
•Defective adjustment of relief valve (•Repair)
(•Check, adjust)