Operation and maintenance manual

Section 250-0045
Braking System - Motor/Triple Pump Assembly
SM 2162 8-02
2
4. Remove blanking cap from remote drain line at the
bottom of the brake coolant tank. Install a length of
hose on remote drain fitting, open drain cock and drain
brake cooling oil into a suitable container. Close drain
cock, remove hose and reinstall blanking cap.
5. Clean motor/triple pump (1) assembly and
surrounding area with a suitable solvent. Identify and
tag all hydraulic lines connected to motor/triple pump
(1), to aid in 'Installation'.
6. With suitable containers available to catch leakage,
disconnect hydraulic lines. Fit blanking caps to all
open lines.
7. Remove bolt (7), washers (8 & 9) and rubber plate
(6) securing motor/triple pump (1) to bracket.
8. Remove nuts (5), washers (4), bolts (3) and rubber
plate (10) securing motor/triple pump (1) to bracket.
DISASSEMBLY
Numbers in parentheses refer to Fig. 1.
1. Place motor/triple pump (1) assembly in a soft-
jawed vice, and clamp on body. Match mark pump
sections and motor to aid in assembly.
Note: Do not clamp vice on machined surfaces of the
assembly at any time.
2. Note location of all hydraulic connectors and
adaptors and remove from motor/triple pump (1).
3. Unscrew and remove relief valve (2) from motor/
triple pump (1) body.
4. Remove hexagon socket bolts and washers from
motor/triple pump (1) to separate motor section from
pump elements. Tap motor section with a soft hammer
if required.
Note: Do not attempt to pry the motor/triple pump (1)
assembly apart with a large screwdriver or pry bar.
The machined surfaces of the assembly may be
damaged.
5. Remove bolts from motor section if further
disassembly is required.
6. Remove nylock nuts to allow pump elements to be
separated.
Note: Do not attempt to pry the pump elements apart
with a large screwdriver or pry bar. The machined
surfaces may be damaged.
7. Remove and discard seals that are to be replaced
with new seals in kit.
INSPECTION
Numbers in parentheses refer to Fig. 1.
1. Clean all parts in a suitable solvent and dry with
compressed air.
2. Check ports threads and make sure they are not
damaged or stripped.
3. Check relief valve cartridge (2) for damage. Ensure
valve seat is not worn, scored or cracked.
It is not recommended that the valve cartridge (2) is
disassembled for maintenance purposes. Ensure that
assembly is cleaned prior to removal of any
components and that no contaminant is allowed to
enter the internal galleries.
ASSEMBLY
Numbers in parentheses refer to Fig. 1.
1. From seal kit, replace seals on motor section and
pump elements prior to re-assembly.
2. Lightly oil parts prior to re-assembly.
3. Assemble three pump elements together and
secure with threaded rods and nylock nuts.
4. If disassembled, assemble motor section and
secure with bolts.
5. Install motor section to pump elements and secure
with hexagon socket bolts and washers.
6. Refit relief valve (2) to motor/triple pump (1) body.
7. Install hydraulic connectors and adaptors to correct
ports and orientation.
INSTALLATION
Numbers in parentheses refer to Fig. 1.
Note: Tighten all fasteners to standard torques listed
in Section 300-0080, STANDARD BOLT AND NUT
TORQUE SPECIFICATIONS.
Note: Tighten all hydraulic lines fitted with ORFS