HYDRAULIC SYSTEM TMS700E SERVICE MANUAL
2-14 Published 01-29-2015, Control # 512-01
HYDRAULIC PUMPS
Description
The engine PTO driven pump drive drives the No. 1 pump.
The No. 1 hydraulic pump mounts on the pump drive. Each
of its three sections is a gear pump. The first section of the
pump, the one closest to the mounting face, is a 73.7 cm³
(4.50 cu in) section with a theoretical output of 184.3 lpm
(48.7 gpm) at 2604 rpm (engine speed of 1800 rpm). The
second section of the pump is a 28.2 cm³ (1.72 cu in) section
with a theoretical output of 70.4 lpm (18.6 gpm) at 2604 rpm.
The third section is a 35.6 cm³ (2.17 cu in) section with a
theoretical output of 88.9 lpm (23.5 gpm) at 2604 rpm.
The No. 2 hydraulic pump is mounted on the engine and is
directly driven by the engine at 1.16 times engine rpm. The
gear pump displacement is 44.1 cm³/rev (2.69 in³/rev). The
pump pumps at a theoretical rate of 88.2 lpm (23.3 gpm) at
2088 rpm. An integral flow divider/relief valve ensures a
constant 37.9 l/min (10 gpm) at 13,800 kPa (2175 psi) at the
primary port.
The No. 3 hydraulic pump is mounted on the air compressor
and is driven by the engine at 1.16 times engine rpm. The
gear pump displacement is 39.3 cm³/rev (2.40 in³/rev). The
pump pumps at a theoretical rate of 78.7 lpm (20.8 gpm) at
2088 rpm.
The purpose of these pumps is to convert the mechanical
energy of the engine into fluid energy for the operation of the
crane’s hydraulic components.
Maintenance
No. 1 Pump Removal
1. Remove parts as needed to gain access to the pump. It
is bolted to the pump drive.
2. Tag the supply lines to the pump and tag the distribution
lines from the pump, then disconnect them. Cap or plug
the lines and ports. \
3. Remove the bolts and hardened washers attaching the
No. 1 pump to the pump drive. Remove the pump.
4. Discard the gasket. Clean the gasket compound and
any gasket residue from the pump drive and the No. 1
pump.
5. Cover the pump drive’s opening to prevent dirt from
entering.
No. 1 Pump Inspection and Repair
Refer to the Shop Reference and Maintenance Guide for
repair instructions as applicable.
No. 1 Pump Installation
1. Remove the pump drive temporary cover.
2. Apply gasket compound (Spec. 6829013865, Loctite
Master Gasket 518) to the No. 1 pump’s gasket’s faces.
Place the gasket on the mounting flange of the pump.
3. Install the No. 1 pump on pump drive with bolts and
hardened washers. Make sure gear teeth mesh
properly. Tighten bolts; refer to Fasteners and Torque
Values, page 1-12 for the torque value for the pump
mounting bolts. Make sure gasket seals properly.
4. Connect the distribution and supply lines as tagged
during removal. Apply medium strength thread locking
compound (Spec. 6829012418, Loctite 243) to the bolts
that attach the lines to the pump; discard old O-rings and
use new ones with the lines, bolts, and flange halves.
No. 2 Pump Removal
1. Remove parts as needed to gain access to the pump. It
is bolted to the engine.
2. Tag the supply lines to the pump and tag the distribution
lines from the pump, then disconnect them. Cap or plug
the lines and ports.
3. Remove nut and lockwasher to free the No. 2 pump from
the pump support plate. As needed, loosen or remove
the 3/8-16 bolt and its washer to move or remove the
pump support plate.
4. Remove the bolts and washers attaching the No. 2 pump
to the drive pad on the engine. Remove the pump.
CAUTION
Absolute cleanliness is essential when working on the
hydraulic pumps. The presence of dirt and foreign
materials in the system can result in serious damage or
inadequate operation.
CAUTION
Keep the pump as level as possible to avoid damaging
the input spline.
CAUTION
Absolute cleanliness is essential when working on the
hydraulic pumps. The presence of dirt and foreign
materials in the system can result in serious damage or
inadequate operation.
CAUTION
Keep the pump as level as possible to avoid damaging
the input spline.
Reference Only
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