Procedure for Cutting Deck Circuit Relief Pressure
Test
10.Open the tester flow control valve, disengage cutting
decks and stop the engine. Record test results.
1.
Make sure hydraulic oil is at normal operating tem-
peraturebyoperatingthemachineforapproximatelyten
minutes. Make sure the hydraulic tank is full.
11.If specification is not met, make sure that electrical
connections at deck control manifold are secure and
then clean or replace relief valve (PRV1 or PRV2) in the
deck control manifold (see Deck Control Manifold Ser-
vice in the Service and Repairs section of this chapter).
Also, if pressure is still low after relief valve service,
check for restriction in pump intake line. Gear pump P1
and/or P2 could also be suspected of wear or damage
(see Gear Pump P1 and P2 Flow Test in this section).
(10)
2.
decks lowered and off. Make sure engine is off and the
parking brake is engaged.
Park machine on a level surface with the cutting
CAUTION
12.After
testing is complete, disconnect tester from
deck motor and hose. Connect hydraulic hose to motor.
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.
#4
Deck
#1 Deck
#5 Deck
3.
Determinecuttingdeckmanifoldreliefpressuretobe
tested:
A. For pump section (P1), cutting deck manifold re-
liefistestedattheinlettothedeck #5motor (Fig.44).
B. For pump section (P2), cutting deck manifold re-
liefistestedattheinlettothedeck #1motor (Fig.44).
#2
Deck
#3
Deck
#
(GM4700)
6 Deck
#7 Deck
(GM4700)
4.
inlet hose and deck motor fitting (Fig. 45). Disconnect
the inlet hydraulic hose from the deck motor.
Thoroughly clean junction of appropriate hydraulic
IMPORTANT: Make sure that the oil flow indicator
arrow on the tester is showing that the oil will flow
from the disconnected hose, through the tester and
into the deck motor.
CUTTING DECK LOCATIONS
Figure 44
5.
series with the the disconnected hose and deck motor
inlet.
Install tester with pressure gauge and flow meter in
Rotation Direction
6.
Make sure the flow control valve on the tester is fully
open.
1
2
CAUTION
Keepawayfromdecksduringtesttopreventper-
sonal injury from the cutting blades.
3
7.
Move throttle to full speed (2870 RPM). Engage the
cutting decks.
Figure 45
1.
2.
Flow IN
Flow OUT
3.
Case drain
8.
closing the flow control valve on tester.
Watch tester pressure gauge carefully while slowly
9.
from 3400 to 3750 PSI (235 to 258 bar).
As the relief valve lifts, system pressure should be
Groundsmaster 4500--D/4700--D
Page 4 -- 53
Hydraulic System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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