Groundsmaster 4500--D/4700--D Hydraulic SystemPage 4 -- 51
Procedure for Cutting Deck Circuit Pressure Test
1. Make sure hydraulic oil is at normal operating tem-
peraturebyoperatingthemachineforapproximatelyten
(10) minutes. Make sure the hydraulic tank is full.
2. Park machine on a level surface with the cutting
decks lowered and off. Make sure engine is off and the
parking brake is engaged.
3. Raisehoodtoallowaccesstodeckcontrolmanifold.
CAUTION
Prevent personal injury and/or damage to equip-
ment. Read all WARNINGS, CAUTIONS and Pre-
cautions for Hydraulic Testing at t he beginning
of this section.
4. Install 5000 PSI (350 bar) pressure gauge with hy-
draulic hose attached to deck control manifold test port
for the cutting deck circuit to be tested (Fig. 41 or 42).
5. After installing pressure gauge, start engine and run
at idle speed. Check for hydraulic leakage and correct
before proceeding with test.
CAUTION
Keepawayfromdecksduringtesttopreventper-
sonal injury from the cutting blades.
6. Move throttle to full speed (2870 RPM). Engage the
cutting decks.
7. Watch pressure gauge carefully while mowing with
the machine.
8. Cuttingdeckcircuitpressureshouldbefrom1000to
3500 PSI (69 to 241 bar) and will vary depending on
mowing conditions.
9. Disengage cutting decks. Shut off engine. Record
test results.
10.Aftertestingiscomplete,disconnectpressuregauge
from manifold test port.
11.Lower and secure hood.
1. Test port G1 (decks 2, 3, & 5)
2. Test port G3 (decks 1 & 4)
Figure 41
GM 4500--D
1
2
FRONT
1. Test port G1 (decks 2,3,5,7)
2. Test port G3 (decks 1,4,6)
Figure 42
GM 4700--D
1
2
FRONT
Figure 43
#4 Deck #1 Deck #5 Deck
#7 Deck
(GM4700)
#6 Deck
(GM4700)
#3
Deck
#2
Deck
CUTTING DECK LOCATIONS
Hydraulic
System
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