TROUBLESHOOTING 777 SERVICE MANUAL
10-20 Published 10-01-2012, Control # 045-08
Problem 18
Travel system response is sluggish.
POSSIBLE CAUSES
Pump or motor is damaged; Travel speed out of adjustment.
CHECKS
Use a gauge to check charge pressure at travel pressure senders.
300 psi or more
300 psi or less
Manually stroke travel pump with brakes applied.
(See Test 11.) Is system pressure greater than 6,000 psi?
Adjust charge pressure relief for 350 psi.
(See Test 14.) Is 350 psi obtained?
Yes
No
No
Yes
No
Yes
No
Adjust multifunction valve for 6,000 psi system pressure.
(See Test 12.) Retest with brakes applied. Is pressure ok?
Adjust travel speed per Shop Procedure topic in Section 2
of Service Manual. Is correct speed obtained?
Travel system response
should be correct.
Check for leakage at motor. (See Test 18.)
Normal
High Leakage
High Leakage
Repair or replace travel pump.
Check for leakage at pump. (See Test 18.)
Repair or replace travel motor.
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