Charge Hydraulic System - Toro Reelmaster 3550-D Preliminary Service Manual

Charge Hydraulic System

NOTE: When initially starting the hydraulic system with
new or rebuilt components such as pumps, motors or lift
cylinders, it is important that the hydraulic system be
charged properly. Air must be purged from the system
and its components to reduce the chance of damage.
IMPORTANT: Change hydraulic oil filter whenever
hydraulic components are repaired or replaced.
1. Park machine on a level surface. Lower cutting units,
stop engine and engage parking brake. Remove key
from the ignition switch.
2. Make sure all hydraulic connections, lines and com-
ponents are secured tightly.
3. If component failure was severe or the system is con-
taminated, flush and refill hydraulic system and tank
(see Flush Hydraulic System in this section).
4. Make sure hydraulic reservoir is full. Add correct hy-
draulic oil if necessary.
5. Disconnect wire harness connector from engine run
solenoid to prevent the engine from starting.
6. Check control rod to the piston (traction) pump for
proper adjustment, binding or broken parts.
7. Make sure traction pedal is in the neutral position.
Turn ignition key switch to start and engage starter for
ten (10) seconds to prime the traction and gear pumps.
Let starter cool and then repeat cranking procedure
again.
8. Connect wire harness connector to engine run sole-
noid.
9. Raise one front and one rear wheel off the ground
and place support blocks under the frame. Chock re-
maining wheel to prevent movement of the machine.
10.Make sure traction pedal is in neutral. Start engine
and run it at low idle (1400 RPM). The pumps should
pick up oil and fill the hydraulic system. If there is no in-
dication of fill in thirty (30) seconds, stop the engine and
determine the cause.
Hydraulic System
11. After the hydraulic system starts to show signs of fill,
actuate lift control until the lift cylinder rods move in and
out several times. If the cylinder rods do not move after
fifteen (15) seconds or the pump emits abnormal
sounds, shut the engine off immediately and determine
cause or problem. Inspect for the following:
A. Loose hydraulic oil filter or oil suction lines.
B. Blocked oil suction line.
C. Faulty charge relief valve.
D. Faulty gear pump.
12.Once lift cylinders do move, proceed to step 13.
13.Operate the traction pedal in the forward and reverse
directions. The wheels off the ground should rotate in
the proper direction.
A. If the wheels rotate in the wrong direction, stop
engine and inspect hydraulic line placement at pis-
ton (traction) pump and wheel motors. Correct hy-
draulic line installation before proceeding.
B. If the wheels rotate in the proper direction, pro-
ceed with procedure.
14.Adjust traction pedal to the neutral position.
15.Check operation of the traction neutral switch.
16.Stop engine, remove blocks from frame and lower
machine. Remove chocks from remaining wheel.
17.If the piston (traction) pump or a wheel motor was re-
placed or rebuilt, run the machine so all wheels turn
slowly for ten (10) minutes.
18.Operate machine by gradually increasing its work
load to full over a ten (10) minute period.
19.Stop the machine. Check hydraulic reservoir and fill
if necessary. Check hydraulic components for leaks and
tighten any loose connections.
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