TYM T303HST, Workshop Manual

Page: 77 / 249

2. HYDROSTATIC PUMP
PRESSURE TEST
Reason:
To ensure that internal parts of the hydrostatic pump
are not worn excessively,and the relief valves are
operating properly.
Equipment:
JT03362 68947KPa (10,000 psi) Gauge
JT03364 Hose with quick coupler
JT03240 7/16-20M 37
°
X7/17-20 F 37
°
Elbow
JT03264 Quick coupler F7/16-20 F 37
°
Adaptor
JT05480 Quick coupler MXM14-1.5 ORB
Adapter
4.Start engine and run until hydraulic oil is
warm.
5.Stop engine
6.Cycle all controls to relieve any pressure
that may be in the hydraulic system
7.Locate test ports on hydrostatic
transmission inside tunnel opening.
8.Remove test port plugs.
9.Install one JT05480 male quick coupler
into each test port.
10.Attach JT03362 gauge and hose assembly
as shown each test port adapter
IMPORTANT: Make sure that the hydraulic fluid
is visible in sight glass.Insufficient hydraulic
fluid could cause system to run dry and
damage pump and motor.
IMPORTANT: Do not allow valves to relieve for
more than 10 seconds or hydraulic oil may
overheat.
Procedure:
1.park tractor on a level surface
2.Turn key switch to OFF position.
3.Make sure 4WD lever is in unlocked 2WD
position.
11.Position gauges so they can be read from
operator’s seat.
12. Perform test from operators seat.Make
sure park brake in engaged and press right
and left brake pedals.Place range
transmission shift lever in 3 (high)
position.Start engine and run at full throttle.
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