Problem 6
Crawler travels at slow speed.
POSSIBLE CAUSES
Partial control voltage from handle to PC; Partial control voltage from PC to pump EDC; Pump or motor damaged.
CHECKS
Check travel speed switch for high-speed selection.
Selected Not Selected
Is 2-speed travel valve receiving a voltage signal from PC?
Select high speed.
Yes No
Check 2-speed travel valve for mechanical
problems by manually enabling spool.
Is engine RPM is more than 1,800 on screen?
Problem
Yes No
No Problem
Repair or
replace valve.
Check speed encoder for correct
setting and operation. (See Test 4.)
Remove plug at motor port M5 and check
orifice for obstruction. (See Test 15.)
Increase engine speed.
Obstruction No Obstruction
Is throttle in maximum RPM position?
Yes
No
When moving applicable travel control handle fully in both directions, TRACK
diagnostic screen (banks 1 or 3) obtains 100% handle control in each direction?
Yes No
When moving travel handle fully in both directions, TRACK diagnostic
screen (banks 2 or 4) obtains 100% pump control in each direction?
Repair or replace
control handle/wiring.
Yes No
Check for control voltage of +2.3 volts or more and coil
resistance of around 19 ohms at pump EDC. (See Test 13.)
Consult dealer/factory.
Voltage and Coil Ok Voltage and/or Coil not Ok
Is system pressure above 3,900 psi
at motor port M4? (See Test 15.)
No
Repair or replace coil or wiring.
Crawler is in high speed. Check for pump
and motor leakage. (See Test 21.)
Clean or replace orifice.
When moving travel handle fully in both directions, A1 diagnostic screen
(banks 4 and 5) reads 38 to 120 in reverse or 136 to 215 in forward?
Yes
No
Repair or replace
control handle/wiring.
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