NOTE: GearpumpP1supplies hydraulic flowtocutting
decks 5, 3 and 2 (also deck 7 on the GM 4700--D). Gear
pump P2 supplies flow to cutting decks 1 and 4 (also
deck 6 on the GM 4700--D).
IMPORTANT: Do not fully restrict oil flow through
tester. In this test, the flow tester is positioned be-
fore the circuit relief valve.Pump damage canoccur
if the oil flow is fully restricted.
Procedure for Gear Pump P1 and P2 Flow Test
8. Watch tester pressure gauge carefully while slowly
closing the flow control valve on tester until 2000 PSI
NOTE: Overaperiodoftime,thegearsandwearplates
in the gear pump can wear. A worn pump will by pass oil
andmakethepumplessefficient.Eventually,enoughoil
loss will occur to cause the cutting deck motors to stall
under heavy cutting conditions. Continued operation
with a worn, inefficient pump can generate excessive
heat and cause damage to the seals and other compo-
nents in the hydraulic system.
(138
gine speed is 2870 RPM.
bar) is obtained. Verify with a phototac that the en-
9. For a pump in good condition, flow indication should
be approximately 11.5 GPM (43.5 LPM).
10.Fully
engine off. Record test results.
open flow control valve on tester and then shut
11.
If measured flow is less than 9.6 GPM (36.3 LPM)
1.
Make sure hydraulic oil is at normal operating tem-
peraturebyoperatingthemachineforapproximatelyten
minutes. Make sure the hydraulic tank is full.
or a pressure of 2000 PSI (138 bar) cannot be obtained,
check for restriction in the pump intake line (including oil
filter and oil cooler). If line is not restricted, remove gear
pump and repair or replace as necessary.
(10)
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.
12.After
draulic hose and fitting. Connect hose to the gear pump
fitting.
testing is complete, disconnect tester from hy-
3.
Raise hood to allow access to pump assembly.
13.Repeat
test for second pump section if required.
and secure hood after testing is completed.
CAUTION
14.Lower
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.
RIGHT
FRONT
4.
Locate gear pump section to be tested (P1 or P2).
Thoroughly clean junction ofappropriate hydraulic hose
and gear pump fitting. Disconnect hydraulic hose from
hydraulic fitting in gear pump (Fig. 48).
2
1
IMPORTANT: Make sure that the oil flow indicator
arrow on the tester is showing that the oil will flow
from the gear pump fitting, through the tester and
into the disconnected hose.
5.
Install tester with pressure gauge and flow meter in
series with the disconnected hose and fitting in gear
pump section. Make sure the flow control valve on
the tester is fully open.
3
Figure 48
6.
speed. Check for hydraulic leakage and correct before
proceeding with test.
After installing tester, start engine and run at idle
1.
2.
Gear pump
Pump section P1 hose
3.
Pump section P2 hose
7.
RPM). Do not engage the cutting decks.
Start engine and move throttle to full speed (2870
Groundsmaster 4500--D/4700--D
Page 4 -- 57
Hydraulic System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
|---|---|
| Tags | Toro Groundsmaster 30857, Toro Groundsmaster 30858, Toro Groundsmaster 4500 D, Toro Groundsmaster 4700 D |
| Download File |
|
| Document Type | Service Manual |
| Language | English |
| Product Brand | Toro. Customer Service Representatives are available by phone:
Monday - Friday 7:30 a.m. to 9:00 p.m. (CDT) - Saturday 8:00 a.m. to 8:00 p.m. (CDT) - Sunday 10:00 a.m. to 8:00 p.m. (CDT)
Canada 1-888-225-4886 USA 1-888-384-9939, Lawn Mower |
| Document File Type | |
| Publisher | toro.com |
| Wikipedia's Page | Toro Company |
| Copyright | Attribution Non-commercial |
(0 votes, average: 0 out of 5)