Toro 03781, Service Manual

Page: 111 / 468

Reelmaster 7000−D Hydraulic System Page 5 − 41
Traction Circuit − Charge Pressure Test
The charge pressure test is one of the tests recommen-
ded to determine traction circuit performance. A charge
pressure drop of more than 20% indicates an internal
leak in the piston (traction) pump. Continued unit opera-
tion can generate excessive heat, cause damage to
seals and other components in the hydraulic system,
and affect overall machine performance.
Special Equipment Required:
S
Pressure Gauge − 1000 PSI (70 bar) with hose
S
Tee Fitting − 13/16 − 16
S
Diagnostic Fitting
S
Phototach (non−contact tachometer) for units
with Kubota diesel engine
CAUTION
Test machine in an open area, away from people
and obstructions.
1. Park machine on a level surface with the cutting units
lowered and the reel engage/disengage switch is in the
disengage position. Make sure engine is off and the
parking brake is engaged.
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.
2. Make sure that traction pedal is adjusted to the neu-
tral position (see traction unit Operator’s Manual).
3. Disconnect the charge circuit hose at the bottom of
the piston (traction) pump. This hose comes from the
charge filter (Fig. 30).
4. Install a tee fitting, diagnostic fitting, and a 1000 PSI
(70 bar) pressure gauge with hose between the piston
(traction) pump fitting and disconnected hose. The pres-
sure gauge hydraulic hose must be long enough to safe-
ly view the pressure gauge while sitting in the operator’s
seat.
1. Piston (traction) pump 2. Charge circuit hose
Figure 30
1
2
FRONT
LEFT
5. Start engine and run at low idle speed. Check for hy-
draulic leakage and make corrections if necessary be-
fore proceeding with test.
6. Set throttle to full speed.
A. Use the InfoCenter display to verify engine RPM
on units with Yanmar diesel engines (2850 RPM).
B. Use a phototach to verify engine RPM on units
with Kubota diesel engines (2850 +50/−120 RPM).
7. Make sure hydraulic fluid is at normal operating tem-
perature by operating the machine for approximately 10
minutes.
8. Record reading on pressure gauge. Charge pres-
sure (without load) should read approximately 207 PSI
(14.3 Bar). If charge relief pressure specification is not
met, consider the following:
A. Restriction in gear pump intake line.
B. Charge relief valve (check valve the lift manifold)
is faulty (see Lift Manifold in this chapter).
C. Gear pump (P3) is faulty (steering/lift circuit per-
formance will also be affected). Test gear pump (P3)
flow as outlined in this chapter.
9. Sit in the operator’s seat, release the parking brake,
apply the brakes and slowly depress the forward traction
pedal about half way.
Hydraulic
System