Citytrac 4200
Citymaster 1200
Citycleaner
Service Documents
For internal use only
Status
March 2009
Page
49 of 108
Faults: In the case of transport mode, the end speed of 25 km/h is not reached
Possible causes:
Engine does not reach the final speed: Air filter is blocked; fuel filter is blocked.
The valve Y13 (wheel motors connected in series) is not energised.
Solution:
Clean the air filter or fuel filter, change them if necessary and check whether the engine reaches the end speed when idling
(2750 rpm +/- 25 rpm (no load applied))
Check the electrical system and clear the fault.
1. Is power applied to Y13?
a) Is the hand throttle in transport mode position?
b) Check fuses F6, F14.
c) Energise Y13 directly; if valve Y13 now switches properly (25 km/h is reached), the electrical test can continue.
d) Contacts on the Y13 connector are in order (no corrosion, contacts fit correctly in the connector; B+ on Pin 1; B- on Pin 2 of X41). Check the resistance of
coils on Y13 (set value: approx. 6
Ω
).
e) Switch the relays K1 and K6 through (refer to circuit diagram).
When the electrical system test is completed successfully, without fault clearance:
2. Y13 does not switch mechanically.
Possible cause: Valve Y13 is stiff or jammed.
Solution:
Disassemble Y13 and clean it; in the event of defect mechanical parts, the valve must be replaced (refer to Pages 36 + 37 for details).
Note:
The jamming of valves is caused to 80% by contaminated hydraulic oil. Please filter the hydraulic system using a bypass filter system to clean the hydraulic oil,
otherwise more faults can be expected on other valves!
Note:
When changing the hydraulic oil, it is essential to ensure that the system is only filled with filtered hydraulic oil. To do this,
the filling and filter systems must use filters not in excess of 5
µ
µ
µ
µ
!
