Cub Cadet Z-Wing - Manual (Page 58)

Cub Cadet Commercial Z-Wing
54
24.23.After the 300 PSI (20.68 Bar) flow reading is
noted, close the load valve further, until the pres-
sure gauge reaches 1,100 PSI (57.85 Bar). Note
the flow rate. See Figure 24.23.
24.24.After noting the high pressure flow rate:
• Open the load valve to relieve the pressure.
• Return the lap bar to the neutral position.
• Throttle-down, then turn-off the engine.
24.25.Interpretation:
• If the difference in flow between the low pres-
sure reading and the high pressure reading is
greater than 1.5 GPM (5.61 LPM), the pump has
a problem and should be replaced.
• If the difference in flow between the low pres-
sure reading and the high pressure reading is
less than 1.5 GPM (5.61 LPM), the pump is
working properly.
• If the pump is working properly and other factors
have been eliminated, the wheel motor has a
problem and should be replaced.
25. HYDRAULIC DRIVE SYSTEM: PUMP
REMOVAL
25.1. The drive system employs a pair of Hydro-Gear
pumps:
• If a hydrostatic pump suffers a warrantable fail-
ure, it is to be replaced as a complete unit. The
dealer will be required to return the pump to Cub
Cadet for inspection and vendor recovery.
• Outside of warranty, the pumps can be feasibly
rebuilt for the customer or as an exchange unit.
25.2.Observe normal hydraulic precautions when ser-
vicing these pumps:
• Allow the engine and drive system to cool before
disconnecting any fittings that may expose the
technician to hydraulic fluid.
• If the hydraulic system or gauge set develop any
leaks in the course of operation or testing: dis-
continue operation immediately, identify and
repair the leak.
• Relieve pressure from the system before discon-
necting any components or fittings: with the
engine and brake off, stroke the controls through
their full range of motion.
• Clean the area surrounding any components or
fittings to be disconnected to prevent contamina-
tion of the hydraulic fluid.
• Clean-up any spilled fluid to prevent accidents.
• Wear eye protection while servicing hydraulics.
25.3. After the engine cools sufficiently to safely work
near the muffler, relieve tension from the drive
belt and slip the belt off of the pulley driving the
pump to be removed. See Figure 25.3.
Figure 24.23
Valve:
nearly closed
Pressure:
1,100 PSI
Flow:
26-27 LPM
Figure 25.3
Drive belt
tensioner
Pump
drive
pulley