Section E - Hydraulics
Fault Finding
Hydrostatic Transmission
E - 32 E - 32
9803-9450-2
9 Feed hose failure Check motor feed hoses.
10 No hydraulic feed to joystick Check for feed to joystick. K
Checking the
Joystick Hydraulic
Lines ( T E-42)
11 No hydraulic feed from joystick to
pump
Check for feed from joystick to pump. K Checking the
Joystick Hydraulic
Lines ( T E-42)
12 Brake hose failure Inspect brake hoses.
13 Brake release pressure incorrect Check charge/brake pressure.
14 Electrical failure (brake valve circuit) Check brake valve electrical circuit. Sect. C
15 Brake valve inoperative Check valve (sticking spool, etc.)
16 Brakes not released Inspect motor brakes for seal damage. Repair as
required.
17 Mechanical brake failure Check brake components (worn plates, spring
damage, etc.).
18 Motor leakage Check motor case drain for confirmation of internal
leakage (compare one motor with the other).
Pulsing leakage indicates piston ring damage;
continuous leakage, possibly more in one
direction than the other, indicates distributor seal
damage. On wheeled machines, check for shaft
seal leakage by checking chain case oil level -
increase in oil level indicates possible leakage.
K
Checking Motor
Leakage
Rate ( T E-40)
19 Joystick inoperative Check joystick (plunger movement, leaking seals,
etc.)
20 Chain tension Check chain tension. Section 3
21 Motor failure Inspect motor for damage. Repair as required.
22 Chain/sprocket damage Inspect chain and sprocket. Repair as required.
23 Pump/engine drive coupling failure Check coupling. K
Pump/Engine
Coupling ( T E-76)
24 Internal damage Noise once per revolution indicates piston
damage. Noise eight times per revolution
indicates cam damage. Repair as required.
25 Timing incorrect or stop pin damaged Inspect motor for damage or incorrect timing.
Repair as required.
26 Dirt or fault in motor flushing circuit Inspect motor for dirt or damage. Repair as
required.
27 Power Management System (PMS)
fault
Do PMS check. K
System
Check ( T E-50)
28 Power Management System (PMS)
fault
See PMS Fault Tracing, Low tractive effort at
high engine speed
K Fault
Tracing ( T E-51)
Key to Cause Remedy Page Ref.
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