Procedure for Lift Cylinder Internal Leakage Test:
11.After testing is completed, remove the support from
the cutting deck (or implement). Start engine and oper-
ate lift cylinders through several up and down cycles.
Stop the engine and check for any leakage.
The lift cylinder internal leakage test should be per-
formed if a cutting deck (or implement) raise and lower
problemisidentified.Thistestwilldetermineiftheliftcyl-
inders are faulty.
12.Check hydraulic oil level in reservoir (front axle).
NOTE: Cuttingdeckraise/lowercircuitoperationwillbe
affected by lift cylinder binding, extra weight on the cut-
ting deck (or implement) and/or binding of lift compo-
nents. Make sure that these items are checked before
proceeding with lift cylinder internal leakage test.
1
1.
switch OFF. Set the parking brake and block the front
wheels to prevent machine movement.
Park machine on a level surface with the P.T.O.
2.
With the engine running, raise the cutting deck (or
implement) completely. Using blocking or a hoist, sup-
port the cutting deck (or implement) to keep it in the fully
raised position. Turn engine OFF.
2
3.
Place a drain pan under the lift cylinder that is to be
Figure 21
2.
tested for internal leakage. Thoroughly clean the area
around the cylinder return hose at the bottom of the lift
cylinder.
1.
Lift cylinder
Return hose
4.
Loosen the hose clamp and disconnect the cylinder
return hose from the bottom of the lift cylinder (Fig. 21).
Leave the other end of the return hose connected to the
filter adapter on the transmission.
5.
cylinder return hose to prevent hydraulic oil leakage or
suction of air by the transmission.
Securely plug the open end of the disconnected lift
6.
that empty drain pan remains under the open fitting of
the lift cylinder.
Remove all hydraulic oil from drain pan. Make sure
7.
in the RAISE position to pressurize the lift cylinders.
Turn engine OFF.
Start the engine and briefly hold the lift control lever
8.
Check to see if any oil has leaked into the drain pan
from the open fitting of the lift cylinder. If there is any oil
inthedrain pan,the liftcylinder hasinternal leakage and
must be replaced (see Lift Cylinder in the Service and
Repairs section).
9.
If the lift cylinder shows no sign of leakage, remove
the plug from the return hose and install the hose on the
lift cylinder fitting. Secure the hose by tightening the
hose clamp.
10.If
needed, repeat steps 3 through 9 for the other lift
cylinder.
Groundsmaster 3280--D/3320
Page 5 -- 23
Hydraulic System
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