Cub Cadet 5000 Series - Manual (Page 12)

Domestic Series 5000 Hydraulics
8
4. BEST PRACTICES: HYDRAULIC SYSTEMS
NOTE: TESTS All hydraulic tests should be
done with the fluid at normal operating tempera-
ture, and the engine at normal operating speed.
In practical terms, normal operating temperature
means that the tractor should be operated (if not
disabled) for about 5 minutes before testing in
normal temperate climates. If the tractor has
been sitting outside for a week during February
in Green Bay, Wisconsin, it is advisable to store
the tractor in a heated shop for 12 hours before
testing. Normal operating speed is 3,000RPM.
NOTE: CLEANLINESS It is very important to
keep dirt out of hydraulic systems.
• Cleaning the areas around any joint to be dis-
connected, or component to be removed is
advisable.
• Contaminated fluid should be disposed of prop-
erly, not re-used.
• Tools and work benches used for work on
hydraulic systems should also be kept clean.
• Catch pans beneath work will ease clean-up.
• CAUTION: High pressure hydraulic leaks can
be dangerous.
• Wear eye protection while performing tests.
• Do not operate any equipment with obvious
damage to parts such as hoses.
• Do not disconnect any fittings that may be under
pressure. Turn-off the engine and operate the
circuit to relieve pressure.
• Remember that anything (front-end loaders,
backhoe buckets, three-point hitches, etc....) that
is supported by hydraulic pressure will be sub-
ject to gravitational force when that pressure is
relieved.
NOTE: Sealants
• O-ring fittings require no sealant, though light
lubrication with the fluid used in the system is
sometimes helpful.
• Teflon tape is to be avoided. “Flash” from the
tape can dislodge, blocking valves and damag-
ing pumps.
NOTE: Priming
• When a new hydrostatic drive is installed, turn
the input shaft at low speed until charge pres-
sure builds to avoid immediate failure on initial
start-up.
5. FLOW AND PRESSURE TESTS:
HYDROSTATIC DRIVE
NOTE: The fenders have been removed from
the tractor for the sake of photographic clarity.
The test procedure described in this section can
be performed without removing the fenders.
NOTE: It will be necessary to remove the seat.
NOTE: The hydrostatic drive can be removed
from the tractor from beneath without removing
the fenders.
5.1. If the problem is not revealed by any of the
external checks, check the charge pressure.
5.2. Clean the area surrounding the charge pressure
port immediately to the left of the feed tube from
the filter. The plug to the right is not easily
accessible.
5.3. Remove the plug using a 1/4” allen wrench.
5.4. Install a pressure gauge capable of reading 200
PSI (13.80 Bars) in the port that the plug was
removed from. See Figure 5.4.
NOTE: Fitting size: 3/8” ORFS
5.5. Confirm that no unsafe conditions will be created
by starting the engine or operating the drive sys-
tem before performing the test.
5.6. Place the High/Low/Neutral gear selector in neu-
tral, and set the parking brake.
5.7. Start the engine and allow the fluid to warm up
briefly.
Figure 5.4
200 PSI gauge
High
pressure
gauge
Charge pressure port