Greensmaster 3300/3400 Hydraulic SystemPage 5 -- 35
10.If specification is notmet, remove piston pump back
plateassemblythatcontainsthechargereliefvalve(see
Piston (Traction) Pump Service in the Service and Re-
pairs section of this chapter). Repair or replace relief
valve components as necessary.
11.Adynamicchargepressuretestcanbeperformedas
follows:
A. Positionmachinesothataloadcanbeplacedon
thetractionsystem.Forexample,chainthemachine
to an immovable object or chock all drive wheels to
prevent the machine from moving.
B. Withpressuregaugestillconnected,sitintheop-
eratorseat,startthe engineandmovethrottlesoen-
gine is running at high idle speed. Move functional
control lever to the transport position.
C. While monitoring the pressure gauge, push the
tractionpedalintheappropriatedirection(forwardor
reverse) to allow traction system load.
D. The charge pressure should drop no more than
20% from no--load charge pressure measured in
step8 above(e.g. ifchargepressure instep 8is 125
PSI (8.6 bar), chargepressure in forward or reverse
under load should be more than 100 PSI (6.9 bar)).
E. If charge pressure is good under no load, but
drops below specification w hen under traction load,
the piston (traction) pump and/or wheel motors
shouldbesuspected ofwear andinefficiency.When
the pump and/or traction motor(s) are worn or dam-
aged,thechargepumpisnotabletokeepupwithin-
ternalleakageintractioncircuitcomponents.Further
testing of the traction circuit should be completed
(see Piston (Traction) Pump Flow and Wheel Motor
Efficiency Tests in this section).
12.When charge pressure testing is complete, discon-
nect pressure gauge and tee fitting from the hydraulic
hose and hydraulic tube. Connect hose to tube.
1. Piston (traction) pump 2. Hydraulic tube
Figure 20
GREENSMASTER 3300 SHOWN
2
1
1. Hydraulic tube location 2. Hose and tube junction
Figure 21
2
1
GREENSMASTER 3300 SHOWN
Hydraulic
System
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