Test No. 2:Traction Circuit System Pressure - Toro Reelmaster 5100-D Service Manual

TEST NO. 2: Traction Circuit System Pressure
1. Make sure hydraulic oil is at normal operating
temperature by operating the machine for approximate­
ly 10 minutes.
2. Before doing traction pressure test:
A. Drive machine to an open area, lower cutting
units, turn the engine off and engage the parking
brake.
B. If testing forward function, connect a chain to the
rear frame tie-down brackets. Connect the other end
of the chain to an immovable object and remove all
slack from the chain. If testing reverse function,
attach chain to the center of the front frame member
(Fig. 7).
CAUTION
To prevent possible personal injury from
rotating drive shaft, engine must be OFF
before attempting to connect gauge. If gauge
has a hose attached, be careful to route hose
so it will not contact the drive shaft.
3. Connect a 5,000 psi gauge to traction circuit test port
for function to be checked (Fig. 18).
NOTE: Test ports are 7/16-20 SAE O-ring ports.
4. Start the engine and move throttle to full speed
(approx. 3200 RPM).
5. Sit on seat, and with brakes locked, slowly depress
the top of traction pedal. While pushing top of traction
pedal down, look at pressure reading on gauge.
GAUGE READING:
Two-wheel drive (2WD) forward:
Four-wheel drive (4WD) forward: 3200 ± 150 PSI
Reverse (2WD and 4WD): 2750 ± 150 PSI
6. If traction pressure is too low, inspect check/high
pressure relief valves. If problem occurs in one direction
only, interchange the check/relief valves to see if the
problem changes to the other direction (see NOTE
below). Clean or replace valves as necessary. These
cartridge type valves are factory set, and are not adjus­
table. If check/relief valves are in good condition,
replace or overhaul transmission.
NOTE: The forward and reverse check/high pressure
relief valves are different. One valve cartridge has a
machined groove on seating surface and must be in­
stalled in the "reverse" port (see Check and High Pres­
sure Relief Valves in Transmission Repairs section).
®
Reelmaster 5100-D
2750 ± 150 PSI
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2
Figure 18
1. FORWARD test port 2. REVERSE test port
Testing