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Groundsmaster 4500--D/4700--D Hydraulic SystemPage 4 -- 57
Procedure for Cutting Deck Circuit Pressure
Test
CAUTION
Prevent personal injury and/or damage to equip-
ment. Read all WARNINGS, CAUTIONS and Pre-
cautions for Hydraulic Testing at the beginning
of this section.
1. Make sure hydraulic oil is at normal operating tem-
perature by operatingthe machinefor approximately ten
(10) minutes. Make sure the hydraulic reservoir 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. Raise hood to allow access to deck control manifold.
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. 46 or 47).
5. After installing pressure gauge, start engine and run
at low idle speed. Check for hydraulic leakage and cor-
rect before proceeding with test.
CAUTION
Keep away from decks during test to prevent per-
sonal injury from the cutting blades.
6. Increase engine speed to high idle speed. Engage
the cutting decks.
7. Watch pressure gauge carefully while mowing with
the machine.
8. Cutting deck circuit pressure should be from 1000 to
3500 PSI (69 to 241 bar) and will vary depending on
mowing conditions.
9. Disengage cutting decks. Shut off engine. Record
test results.
10.After testing iscomplete, disconnect pressure gauge
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 46
GM 4500--D
1
2
FRONT
1. Test port G1 (decks 2,3,5,7)
2. Test port G3 (decks 1,4,6)
Figure 47
GM 4700--D
1
2
FRONT
Figure 48
#4 Deck #1 Deck #5 Deck
#7 Deck
(GM4700)
#6 Deck
(GM4700)
#3
Deck
#2
Deck
CUTTING DECK LOCATIONS
Hydraulic
System