Pressure Test - Toro Groundsmaster 3500 30807 Service Manual

Cutting Deck Circuit Testing − Pressure Test:
Cutting deck circuit pressure is the first in a series of
tests recommended to check cutting deck circuit per-
formance. The results from this test will help determine
which component(s) are the cause of cutting deck per-
formance issues.
Special Equipment Required:
NOTE: If available, connecting a flow meter with pres-
sure gauge that has at least a 12 GPM (45 LPM) capa-
city at the hydraulic manifold (M1) port instead of
connecting a pressure gauge at manifold port (G1) as
described in this test, will allow performing the pressure
test and manifold relief valve test with the same test con-
figuration (see Cutting Deck Circuit Testing − Manifold
Relief Valve Pressure Test in this chapter).
S Pressure Gauge with extension hose
S Test fitting and cover Toro p/n 354−77 and
354−79
1. Park machine on a level surface with the cutting units
lowered and off. Make sure engine is off and the parking
brake is disengaged.
2. Read Precautions for Hydraulic Testing in this
chapter.
3. Remove plug from hydraulic manifold port (G1) and
install a test fitting and cover (Fig. 30 and 31).
4. Install test gauge with hydraulic hose to manifold port
(G1).
CAUTION
Keep away from decks during test to prevent per-
sonal injury from the cutting blades.
5. Sit in the Operator's seat, start the engine, and move
throttle to full speed (Diesel engine = 3220 + 50 RPM,
Gas engine = 3420 + 30 RPM).
6. Make sure hydraulic fluid is at normal operating tem-
perature by operating the machine for approximately 10
minutes.
7. Engage the cutting units.
When engaged, the cutting circuit pressure should ex-
ceed manifold relief valve pressure setting of 3200 PSI
(220.6 Bar) momentarily opening the relief valve. Circuit
pressure should then stabilize at approximately 1000
PSI (68.9 Bar) with standard combination sail blades in-
stalled.
Groundsmaster 3500
Unit Serial No.
Prior to 314000001
1
2
1. Hydraulic manifold
Unit Serial No.
314000001 & Up
1. Hydraulic manifold
8. Safely secure the test pressure gauge and operate
the machine under your specific mowing conditions.
Monitor test gauge while mowing. Cutting deck circuit
pressure should be approximately 1500 to 2000 PSI
(103.4 to 137.9 Bar) under low load conditions, and can
reach a maximum pressure equal to the manifold relief
valve setting of 3200 PSI (220.6 Bar).
9. Disengage cutting decks, move throttle to low speed
and shut off engine.
10.If pressure readings are within specifications and
cutting deck performance is still in question, test cutting
deck motors individually (see Cutting Deck Circuit −
Deck Motor Efficiency/Case Drain Test).
Page 5 − 47
Figure 30
2. Manifold port (G1)
1
2
Figure 31
2. Manifold port (G1)
Hydraulic System