Hyster D174, Руководство по обслуживанию и ремонту

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1900 SRM 97 Hydraulic Gear Pump Repair
3. Install needle bearings into front and rear covers.
Use a press to push bearings into position. Push
on end of bearings that has writing. If the pump
has check valves, install them in cover.
CAUTION
Make sure the holes in the gaskets and seals are
aligned with the hole in the output side of the
pump. The pump will not operate correctly if
the oil from the outlet chamber cannot flow to
the thrust plate.
4. Install seals for thrust plate. Install rubber seal
with lips away from gears. Install paper gasket
against the rubber seal. The plastic gasket is in-
stalled between the paper gasket and the thrust
plate. Install thrust plate with the bronze side
toward the gears.
Some pumps have thrust plates with small
grooves for the seals.
The seals must be cut
to the correct length. Cut two strips that are
5.5 mm (0.22 in.)
long from seal strip. Put
grease on seals and install them in grooves in
center of thrust plate. Cut thrust plate on front
cover. Hit thrust plate with a plastic hammer
to 0.8 mm (0.031 in.) from machined surface.
Cut four strips 6 mm (0.24 in.) from seal strip.
Push strips into slots in thrust plate. Lightly hit
thrust plate against the machined surface. Use
a sharp blade to cut the seals even with the edge
of the thrust plate.
Install seal that has a W shape and spacer in
groove in front cover. Do not bend metal seal.
Install seal in outer groove in front cover. Install
bearing blocks in the same positions from which
they were removed.
5. Install gears and bearing blocks in pump cham-
ber housing. Make sure gear housing is installed
in the correct position. The small hole in some
housings must be in the outlet chamber. The
large channels in the inlet and outlet chambers
must be toward the rear cover. The arrow indi-
cating the direction of rotation on the gear hous-
ing must be toward the front cover. Align marks
on gear housing with marks on covers.
6. Put connecting shaft in drive gear shaft on the
pumps with two pump chambers. Install thrust
plates and seals.
Put gears and pump cham-
ber housing on center bearing housing with the
marks aligned.
7. Install seal and rear cover. Use a plastic hammer
to join the sections. Apply a small mount of Loc-
tite 290
®
sealant to threads of capscrews or studs.
Install capscrews or studs and tighten with your
fingers. Rotate drive shaft to make sure pump is
assembled correctly. Tighten capscrews or nuts
to the specification using an "X" sequence.
8. Use a soft, blunt tool to install O-rings in bore
of the flow and relief cartridge. See Figure 10.
Install relief valve and flow control valve. Install
fittings with new O-rings.
9. If a pulley was removed, install pulley on shaft
and tighten nut to 72 N•m (53 lbf ft). See Fig-
ure 5.
1. ADJUSTMENT
SCREW
2. SPRING
3. SPRING
4. RELIEF POPPET
5. CARTRIDGE
6. SPRING
7. O-RING
8. FLOW CONTROL
PISTON
9. SNAP RING
10. RELIEF FLOW
11. CONTROLLED
FLOW
12. MAIN FLOW
Figure 10. Flow Control and Relief Valve
Cartridge
9