Specifications

© 2002 Alamo Group Inc.
Parts Section -155
Triumph Sickle Bar (Archive Book) 10/02
MODEL 8500 PITMANLESS MOWER DRIVE:
DRIVE UNIT:
If the drive arm is striking the drive unit housing, there are three possible causes to be checked out.
1. The drive arm clamping screw may be loose. It is very important that this connection be TIGHT
and torqued to 150 ft. lbs. Continued operation with a loose drive arm will pound out the keyway
in the drive unit crankshaft and cause the drive arm to break or cause expensive failure of the
drive unit's internal parts.
2. The flywheel or motor shaft splines may be worn causing overtravel of the drive arm. If this is
the problem, the splined flywheel sleeve and/or motor shaft should be replaced. Check this
connection at least twice a year. Lubricate splines with lubriplate Mo-Lith #2 or Equivalent.
3. The internal bearings in the drive unit may be worn out after long service. In this case, the drive
unit should be replaced or repaired. Internal parts are available for field repairs. Refer to the
parts book page marked 4490 Basic Drive Unit, page #35.4, for the service parts needed to
make these repairs.
FLYWHEEL:
The only service required is replacement of the splined sleeve in the flywheel. Proceed as follows:
1. Remove the four socket head capscrews attaching the motor to the drive unit. It is not
necessary to remove the motor hoses.
2. Pull the motor away from the drive unit.
3. Remove the four socket head capscrews from the flywheel and pull the flywheel out of the drive
unit.
4. Remove the snap ring from the end of the splined sleeve.
5. Unscrew the sleeve from the flywheel. This is a right hand thread.
6. Install the new sleeve. Coat the splines with a thin film of LUBRIPLATE MO-LITH #2 or
equivalent.
7. Reverse the procedure for reassembly. Apply a drop or two of Loctite (Non-Permanent) to the
cap screw threads. Torque the flywheel screws to 30 ft. lbs. Torque the motor screws to 150
ft. lbs.
HYDRAULIC SYSTEM: All Models
PUMP:The pump is the heart of the hyd. circuit & is vital to the performance of all Triumph mowers.
Worn pumps should be replaced or repaired. It is recommended that most customers replace
the #0169900 pump. However, spare parts and seal repair kits are available for field repair if
desired. ALWAYS DRAIN, CLEAN AND REFILL THE TANK WITH CLEAN OIL when pump
repairs are made. Note Changes in Pump Types, See Pump Information in this Book for Pump
Replacement & Pump Identification.
NOTICE: To avoid possible damage to a new or rebuilt pump, run the tractor engine at very
low RPM for about 5 minutes with all control levers in neutral position. If the mower operated
from the tractor's internal pump or loader pump, refer to the tractor manufacturer's service
manual.
MOTOR;Like the pump, the motor also plays a critical part in mower performance. Motors should also
be replaced or rebuilt when they become worn.