PROBLEM 6
Crawler travels only at slow speed.
POSSIBLE CAUSES
Partial control voltage from handle to PC; Partial control voltage from PC to pump EDC; Worn pump or motor.
CHECKS
Check travel speed switch for high-speed selection. Check for 100% travel speed on travel Diagnostic screen.
Selected
Not Selected
Is two-speed travel valve receiving a voltage signal from controller?
Select high speed with switch.
No Yes
Check two-speed travel valve for mechanical
problems by manually enabling spool.
Is engine RPM is more than 1,500 on Information screen?
Problem
Yes No
No Problem
Repair or
replace valve.
Check RPM sender for
correct operation.
Remove plug at motor port M5 and check
orifice for obstruction.
(See Section 2 - Pump Components.)
Increase engine
speed.
Obstruction No Obstruction
Is throttle in maximum RPM position?
Yes No
When moving travel handle fully in both directions, travel Diagnostic screen
show 100% pump control in each direction?
Yes No
Is 24 volts present (full speed) at both sides of EDC coil.
Check coil for a resistance of 17 to 19 ohms at pump.
(See Section 3 - Checking Electrical Inputs/Outputs.)
Consult dealer/factory.
Voltage and Coil Ok
Voltage and/or Coil not Ok
Is system pressure above 3,900 psi (269
bar) at motor port M4? (See Section 2 -
Motor Components.)
No
Repair or replace coil or wiring.
Check for pump or motor leakage.
(See Section 2 - Motor Leakage Test.)
Clean or replace orifice.
When moving travel handles fully in both directions, does travel Diagnostic screen
show handles at 100% in reverse or in forward direction?
Yes No
Replace control handle, node 2
controller, or repair wiring.
Yes
Slow speed is at
required speed.
Brake partially applied. Check brake
pressure source.
No
Yes
Check brake and accessory pump output.
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