Grove Published 01-29-2015, Control # 512-01 2-15
TMS700E SERVICE MANUAL HYDRAULIC SYSTEM
5. Discard the gasket. Clean the gasket compound and
any gasket residue from the engine drive pad and the
No. 2 pump.
6. Cover the drive pad’s opening to prevent dirt from
entering.
No. 2 Pump Inspection and Repair
Refer to the Shop Reference and Maintenance Guide for
repair instructions as applicable.
No. 2 Pump Installation
1. Remove the drive pad temporary cover.
2. Apply gasket compound (Spec. 6829013865, Loctite
Master Gasket 518) to the No. 2 pump’s gasket’s faces.
Place the gasket on the mounting flange of the pump.
3. Install the No. 2 pump on engine drive pad with bolts and
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. Secure the No. 2 pump to the pump support plate with
the nut and lockwasher. Torque nut.
5. If you loosened or removed the 3/8-16 bolt to move or
remove the pump support plate, reinstall and/or tighten
this bolt and its washer.
6. 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.
Pump Startup Procedure and Test
Procedure After Repair or Replacement
1. Ensure the reservoir is filled with the proper hydraulic
fluid to the high level mark on the reservoir sight gauge.
2. Ensure no air is entering the pump inlet, and that the
pump suction or inlet fluid is not bleeding back to the
reservoir when the engine is stopped, by making sure all
suction or inlet lines are air tight.
3. Remove all pump outlet hoses. Fill pump outlet port of
each pump section with as much hydraulic oil as it can
take. Connect all pump outlet hoses again.
4. Start the engine and idle it for two or three minutes
without running any hydraulic functions. Check for leaks;
as needed, stop the engine and make repairs.
5. Place your hand on the pump to check for excessive
heat buildup. If the pump is too hot to keep a hand on,
stop the engine. Each section should feel about the
same warmth, but pressure drops in each pump
section’s circuit would explain some difference between
sections.
6. Listen for abnormal noises indicating low hydraulic oil
level or internal pump problems. If the pump is making
excessive noise, it is probably sucking air into its inlet,
keeping it from priming. In case of abnormal noise, stop
engine, and inspect the pump and the suction line for a
loose connection, a leak, or a damaged or missing O-
ring.
7. If the pump seems to be running properly, increase the
RPM to 1500 to 1800 rpm for one to two minutes while
operating no hydraulic functions. Repeat checks in steps
4, 5, and 6.
8. Increase engine speed in steps to full RPM. Repeat
checks in steps 4, 5, and 6.
9. Cycle the components the pump sections power to verify
the pump sections drive them properly. Verify there is no
leaking.
10. Check pressure settings. Refer to Pressure Setting
Procedures, page 2-22.
PUMP DRIVE
Description
The hydraulic pump drive (Figure 2-5) is mounted on top of
the transmission. The engine powers the pump drive through
the use of a prop shaft mounted between the pump drive and
the engine PTO. The pump drive is used to transmit engine
power to the hydraulic pumps. The pump drive incorporates
a disconnect that is operated by an air cylinder.
CAUTION
Do not feed hot hydraulic oil into a cold pump. This may
cause the pump to seize.
CAUTION
If the pump becomes hot to the touch, it is binding and
may seize. Stop engine, disassemble pump, and repair it
so it will not bind.
CAUTION
The engine must not be cranked to engage the pump. It is
acceptable to “jog” the engine for proper gear
engagement, but it cannot be cranked or damage may
occur.
Reference Only
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