i-MO CIRCOR GLH8L-400 Series User manual

1
Instruction Manual and Parts
List
GLH8L-400 and GLH8L-462
WARNING
This Instruction Manual and General Instructions Manual, CA-1, should be
read thoroughly prior to pump installation, operation or maintenance.
Manual No. SRM00122
Rev. 00
Date: January 2014

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IMPORTANT NOTE
The importance of seal chamber priming cannot be overemphasized. Due to the
prevalence of seal damage and leakage caused by not filling the seal chamber with
liquid before putting a pump in service, this page is located at the beginning of this
document.
SEAL CHAMBER PRIMING
Fill mechanical seal chamber with liquid to insure seal does not start dry. This can be done by
removing seal vent set-screw and pouring liquid into vent passageway before opening pump
inlet. Alternately, seal chamber can be vented in situations where inlet pressure is above
atmospheric by opening inlet and discharge valves and then loosening seal vent plug to allow
positive inlet pressure to push air out of seal chamber until oil flows from it. See figure below.
Filling or Venting Seal Cavity Using Seal Vent
CAUTION
Failure to fill or vent seal chamber as described above may cause damage to seal running
faces which may result in seal leakage.

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READ THIS ENTIRE PAGE BEFORE PROCEEDING
FOR THE SAFETY OF PERSONNEL AND TO PREVENT DAMAGE TO THE EQUIPMENT,
THE FOLLOWING NOMENCLATUREHAS BEEN USED IN THIS MANUAL:
DANGER
Failure to observe the precautions noted in this box can result in severe bodily injury or loss of life.
WARNING
Failure to observe the precautions noted in this box can cause injury to personnel by
accidental contact with the equipment or liquids. Protection should be provided by the user to
prevent accidental contact.
CAUTION
ATTENTION
Failure to observe the precautions noted in this box can cause damage or failure of the
equipment.
Noncompliance of safety
instructions identified by the
following symbol could
affect
safety for persons:
Safety instructions where
electrical safety is involved are
identified by:
Safety instructions which
shall be considered for
reasons of safe operation of
the pump and/or protection
of the pump itself are
marked by the sign:
ATTENTION
ATTENTION
If operation of this pump is critical to your business, we strongly recommend you keep a spare
pump or major repair kit in stock at all times. As a minimum, a minor repair kit (o-rings,
gaskets, shaft seal and bearings) should be kept in stock so pump refurbishment after internal
inspection can be accomplished.

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Table of Contents
GENERAL INSTRUCTIONS .............................................................................................................................. 5
INTRODUCTION............................................................................................................................................. 5
STRUCTURAL LIMITS ..................................................................................................................................... 5
Table 1 – Normal Pump Operating and Structural Limits ......................................................................... 6
DESCRIPTION OF PUMP FEATURES............................................................................................................... 6
Balance...................................................................................................................................................... 6
GLH8L-400 Mod Kit (3268/1000M) and GLH8L-462 Mod Kit (3269/1000M) ........................................... 7
Ball Bearing ............................................................................................................................................... 7
Mechanical Seals....................................................................................................................................... 7
Mounting................................................................................................................................................... 8
End Cover .................................................................................................................................................. 8
Inboard Cover ........................................................................................................................................... 8
Bearing RTD........................................................................................................................................... 8
Vibration Monitoring ............................................................................................................................ 8
PUMP MODEL IDENTIFICATION .................................................................................................................... 9
INSTALLATION ............................................................................................................................................... 9
Inlet Position ............................................................................................................................................. 9
MAINTENANCE............................................................................................................................................ 10
Special Tooling Required......................................................................................................................... 10
Manufactured Tooling ........................................................................................................................ 11
Servicing the Mechanical Seal and Bearing ...........................................................................................12
Mechanical Seal and Bearing Removal ..............................................................................................12
Mechanical Seal and Bearing Installation........................................................................................... 14
PUMP DISASSEMBLY ...............................................................................................................................15
PUMP ASSEMBLY .................................................................................................................................... 16
PARTS LIST................................................................................................................................................... 18
GLH8L-462 PART LIST ............................................................................................................................. 18
GLH8L-400 PART LIST ..............................................................................................................................19
DRAWINGS .................................................................................................................................................. 20

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GENERAL INSTRUCTIONS
Instructions found here in cover disassembly, assembly and parts identification of GLH8L-400
and GLH8L-462 series pumps.
NOTE: Individual contracts may have specific provisions that vary from this manual. Should
any questions arise which may not be answered by these instructions, refer to Imo General
Installation Operation, Maintenance, and Troubleshooting Manual,SRM00046, provided with
your order. For further detailed information and technical assistance please refer to Imo Pump,
Technical/Customer Service Department, at [phone].
Manual cannot possibly cover every situation connected with installation, operation, inspection,
and maintenance of equipment supplied. Every effort was made to prepare text of manual so
that engineering and design data is transformed into most easily understood wording. Imo Pump
must assume personnel assigned to operate and maintain supplied equipment and apply
instruction manual have sufficient technical knowledge and are experienced to apply sound
safety and operational practices which may not be otherwise covered by this manual.
In applications where equipment furnished by Imo Pump is to become part of processing
machinery, these instructions should be thoroughly reviewed to ensure proper fit of said
equipment into overall plant operational procedures.
WARNING
If installation, operation, and maintenance instructions are not correctly and strictly followed
and observed, injury to personnel or serious damage to pump could result. Imo Pump
cannot accept responsibility for unsatisfactory performance or damage resulting from failure
to comply with instructions.
INTRODUCTION
This instruction manual covers Imo Pump GLH8L-400, 400P and 462 with ductile iron cases. This
series of pumps has been designed for use in crude oil applications. The model and design
construction of each pump can be identified by the designator code on the pump nameplate.
Definitions of model designators are identified in Figure 1A.
STRUCTURAL LIMITS
Operating conditions such as speed, fluid, viscosity, inlet pressure, temperature, filtration, duty
cycle, mounting, driving type, etc. are interrelated. Due to variable conditions, specific
application limitations may vary from structural limitations. This equipment must not be
operated without verification that operating requirements are within published capabilities.

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Table 1 – Normal Pump Operating and Structural Limits
Condition
Limit
Maximum Speed 2300 RPM (All speeds above 1800 RPM
must be factory approved)
Minimum Viscosity 60 SSU Minimum Book Rating (Consult
IMO pump for minimum viscosity with
relation to specific speed and pressure)
Maximum Viscosity
Contact factory
Liquid Temperature
250° F
Maximum Inlet Pressure
75 PSIG
Maximum Discharge Pressure (Continuous
Duty) (Size 400) 1500 PSIG
(Size 462) 2000 PSIG
Filtration Imo General Installation, Operation,
Maintenance, and Troubleshooting
Manual,SRM00046
Drive Direct Only
Mounting Foot mounted
DESCRIPTION OF PUMP FEATURES
Balance
WARNING
The GLH series pump parts are not interchangeable with previous designs
unless the factory
has approved to convert the old design to a GLH design using a modification kit. The
modification kit along with the identified GLH major kit will be required to make the conversion.
By design, all rotor sets are hydraulically balanced in the radial direction. Idler rotors (40 and 41)
are balanced axially by internally transferring high pressure oil from the pump discharge end to
the pump inlet end (thrust end). The high pressure oil is transferred to the pump inlet end
through bores that have been drilled axially through the rotor housings (83 and 28).
In order to provide axial hydraulic balance on the power rotor (11), a balance piston (17) is
provided. The sizes of the balance piston (17) and the balance piston bushing (18) in which it

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rotates are selected to produce minimum axial thrust loads on the anti-friction ball bearings (7)
under the conditions of operation that are "normal" for the application.
GLH8L-400 Mod Kit (3268/1000M) and GLH8L-462 Mod Kit (3269/1000M)
Note: Not every previous designed 8L-400/462 can be converted to the GLH8L-
400/462. Please contact IMO for additional details.
Note: Although the converted pump will be annotated as a GLH8L the outline maybe
slightly different due to the inlet head design. Please contact IMO for additional details
The Mod Kit includes the following design changes:
•Bearing spacers - to compensate for additional axial clearances
•Oil Balance tubes - to provide discharge pressure (via housing port) to the GLH thrust
plate (design enhancement to remove gun drilled idlers)
•End cover – provides additional clearance in order to convert from the thrust cage
design to the thrust plate design.
WARNING
When a unit is purchased, if no inlet conditions are specified, the power rotor will be provided
with standard balance. If a unit with standard balance is installed on an operation with high inlet
pressure, both the ball bearings (7) and the mechanical seal (51) may be overloaded. If the unit
has been fitted to operate with high inlet pressure, operation on low inlet pressure can
overload the ball bearings. Do not change inlet pressure radically without approval from Imo
Pump Division.
Ball Bearing
The GLH8L-400 and GLH8L-462 series pumps are equipped with a standard width size 16
Conrad ball bearing.
Mechanical Seals
The GLH8L-400 and GLH8L-462 series pumps are equipped with a positive drive
mechanical seal. This is a balanced mechanical seal with a tungsten carbide rotating
face and a tungsten carbide stationary face (seal type/material is identified in the pump
nomenclature). Refer to mechanical seal drawing, figure 3, for construction.
When ordering new mechanical seals, it is important that the pump designator and/or serial
number be given. When pump designator and/or serial number cannot be ascertained,
operating conditions should be listed so that proper mechanical seal can be supplied.

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Mounting
The GLH8L-400 and GLH8L-462 series pumps are designed for horizontal foot mounting. The
pump case (001) has four feet; the two inboard feet are each drilled to receive two tie-down or
mounting bolts. The rear or outboard feet are each drilled to receive one bolt each. The double
bolting on the inboard or front end is designed to provide rigid location of the pump front end.
The length of the pump and the normal variations in temperature require that allowance be
made for thermal growth. The rigidity of the pump case (001) is usually several times that of
the sub-base or bedplate. If relative movement can’t take place between the outboard feet
and the base, thermal movement can distort the sub-base and produce pump to driver
misalignment.
End Cover
The end cover (50) is designed for RTD installation. The end cover has 2 X ½-14 NPT threaded
connection ports (supplied with plugs (14)) with ¼ inch OD x 1-1/2 inch blind hole for the RTD
probe on the outboard cover (50) for connection of two optional RTD’s.
The RTD’s (when installed) are used to read the temperature in-line with the suction idlers.
These temperatures should be relatively close to each other in normal operation. If a serious
idler rotor thrust loss occurs, the temperature difference between the two idler rotor thrust areas
will be detected.
It is recommended that the operating system should immediately be shut down if the delta
temperature between these two RTDs exceeds 25˚F to 30˚F.
Inboard Cover
Bearing RTD
A ½” – 14 NPT threaded connection with a 5/16” diameter drill through for a temperature sensor
(RTD) probe is provided on the inboard cover (13) This RTD ( when installed) monitors the
temperature of the ball bearing (31). The temperature will vary, depending on the temperature
of the fluid pumped, the speed at which the pump is running and the suction pressure. Typically
the ball bearing temperature will run 50° F to 70° F above the fluid temperature. The maximum
temperature allowed is 250° F.
Vibration Monitoring
A ¼”-18 NPT, ¾” deep with 2” diameter machined surface spot face is provided for installation
of an optional vibration transmitter.

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PUMP MODEL IDENTIFICATION
INSTALLATION
Inlet Position
The inlet flange on the inlet head (37) may be positioned to have the fluid enter the pump from
the top or either side. The inlet flange may be rotated for bottom inlet, but a special seal vent
tube (53) and a positive fluid inlet pressure is required.
CAUTION
ATTENTION
The end cover (50) must always be assembled with the RTD connection ports in-line with the
suction idlers.
To change the position of the inlet head (37) complete the following steps:
1. Disconnect the seal vent line (53) and flare fitting (52) from the inlet head.
2. Install an eyebolt in the ¾-10 x 1-1/8” (2) tapped hole in the end cover (50). While
supporting the weight of the end cover (50) (size 400 - 108 lbs.; size 462 – 133 lbs.),

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remove hex bolts (51). Remove end cover (50). Take care not to damage o-ring (12) or
thrust plate (48).
3. Place a sling or lifting hooks on inlet head (37) (size 400 – 203 lbs.; size 462 – 275 lbs.).
Remove capscrews (20) and lockwashers (21) (size 400: 39 and 38, respectively).
Break inlet head (37) free from the case, taking care not to damage O-ring (12)
4. Rotate inlet head (37) so that the inlet flange is in the desired position, using care in
order to prevent damage to O-ring (12). Install capscrews (38) and lockwasher (39).
Tighten to a torque specification of 340 + 15 lbs. ft. (Size 400: 215 + 15 lbs. ft.)
5. Remove plug (19) that is now on the underside of the inlet head (37) in line with the seal
vent line (53) Install fitting (52), use either pipe thread compound on the threads to
ensure an airtight seal. Connect seal vent line (53) to fitting (52). Install plug (19) in the
tapped opening from which fitting (52) has been taken. Use pipe thread compound to
ensure an airtight seal.
6. Mount cover (50). Check to make sure O-ring (12) is properly seated in the face groove.
Align RTD ports in the plane of the idlers (41). Install hex bolts (51) and tighten to a
torque specification of 193 + 10 lbs. ft. (Size 400: 215 + 15 lbs. ft.)
MAINTENANCE
Special Tooling Required
•Bearing Removal Tool (Figure 1) or Bearing Puller (2-jaw)
•Power Rotor/Housing Removal Strongback (Figure 2)
•¾-10 x 30” Allthread (Qty 2) (Bearing removal)
•Blank (Power rotor/Housing removal)
•1”-8 X 36” Allthread (Power rotor/Housing removal)
•1”- 8 Hex nuts (qty 2) (Power rotor/Housing Strongback to inlet head)
•7/8”- 9 X 14” Allthread (qty 2) and 7/8” Hex nuts and Hardened washers (qty 2
each) for size 400 (Housing removal)
•1”- 8 X 14” Allthread (qty 2) and 1” Hex nuts and Hardened washers (qty 2 each)
for size 462 (Housing removal)
•¾” Hex nuts and Hardened washers (Qty 2 each) (Bearing removal)
•Bar stock 1 1/16” X 4” (qty 2) (Bearing removal)
•½”-13 Jacking Bolt (qty 2) (Inboard cover removal)
•3/8-16 x 2” Bolt (Stop pin removal)
•5/8”-11 X 1-1/4” Eyebolts (qty 2) – optional for size 462 housing
removal/installation
•1”- 8 X 7/8” Eyebolts (qty 2) – optional for size 462 housing removal/installation

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Manufactured Tooling
Figure 1. Bearing Removal Tool
Figure 2. Power Rotor/Housing Removal Strongback

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Servicing the Mechanical Seal and Bearing
Mechanical Seal and Bearing Removal
1. Close inlet and outlet valves. Vent pressure from pump and drain before disconnecting
inlet and outlet lines. The inlet may be drained by loosening tube fitting (52) or removing
plug (19) from outboard end cover (50). Fluid in the outlet can be pumped to the inlet
chamber by rotating the unit counterclockwise. Remove tubing (53) from pump.
2. Remove spacer section of coupling. Disconnect inlet and outlet flanges. Remove pump
from baseplate.
3. Install a ¾”-10 eyebolt (2) in the tapped hole in end cover (050)
(Approx. weight – Size 400: 108 lbs., Size 462: 133 lbs.). Support weight of cover and
remove Hex bolts (051). Remove cover (050).
4. Remove 0-ring (12) and discard.
5. Loosen and remove capscrews (61). Remove thrust plate (48), spacers (88) and oil
balance tube (81) concurrently.
6. Remove O-rings (82) from oil balance tube (81) and discard.
7. Slide idler balance piston housing (044) from idlers (041).
8. Rotate idlers (041) and remove from housing (005). Rotate power rotor (022)
counterclockwise and remove both idlers (040). DO NOT drop idlers as they emerge
from housing (005).
9. Loosen setscrew (056) and remove coupling nut (055). Remove key (054) from power
rotor.
10. Loosen setscrews (75) and remove locknut (33) and nut (32).
11. Remove retainer (034) by removing bolts (035) and lockwashers (036). Grasp power
rotor (022) and pull assembly from pump until the seal seat adapter (63) extends from
the pump.
NOTE
The power rotor may need to be pressed out of the housings due to seal seat adapter/inboard
cover mating surface providing resistance. (Optional) Use the housing strongback along with a
blank to apply even pressure to the outboard size of the power rotor in order to prevent damage
to the mechanical seal faces. Blank must be smaller than the power rotor bore of the housing.
12. Removal of ball bearing (031) can be accomplished using a bearing puller (2-jaw placing
jaws inside outer spacer (30) holes) or by the completing following steps (see special
tools required):
a) Installing allthread into the inboard cover/bearing retainer holes
b) Install coupling nut (55) in order to prevent damaging the power rotor threads.
c) Installing the bearing removal tool on the allthread and securing it using nuts and
hardened washers to the inboard end of the power rotor.
d) Place bar stock in outer spacer holes and rest the bar stock against the inboard
cover.
e) Tighten bearing removal tool nuts evenly until the bearing is free from the shaft.
This will cause the power to be pressed back into the pump.

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f) Remove the bearing (31), inner spacer (29) and outer spacer (30) from the shaft.
Multi-Spring Seal with O-ring Seat (Figure 3)
13. Move power rotor assembly forward to expose mechanical seal assembly (3, Figure 3)
which is mounted on
seal sleeve (26). Slide mechanical seal sleeve off of the power
rotor (22), keeping the seal assembly (3, Figure 2) and stationary seat (1, Figure 3)
intact. This willinclude the following
parts: mechanical seal (27),seal sleeve (26),
retaining ring (28), stationary seat adapter (63) and seat gasket (65). Remove O-
ring (25)from power rotor (22).
14. Remove retaining ring (28) from the groove of the seal sleeve (26).
15. Remove seat adapter (63) with gasket (65). Remove mechanical seal stationary seat (1,
Figure 3) with O-ring (2, Figure 3) from seat adapter (63).
16. Loosen setscrew (3E, Figure 3) from seal spring holder (3D, Figure 3) and slide
mechanical seal rotating assembly (3, Figure 3) from seal sleeve (26).
17. Remove O-ring (25) from internal groove of seal sleeve (26).
18. Inspect the shaft/shaft sleeve and remove any nicks or burrs which are present. Polish
shaft to remove any rust or oxidants that may be present under the seal sleeve area.
NOTE
The manufacturer recommends replacement of ball bearing (31), mechanical seal (27), gasket
(65), and O-ring (25) when these parts are disturbed from their original installed position. All
parts should be coated with light lubricating oil to assist in assembly.

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Mechanical Seal and Bearing Installation
1. Install O-ring (25) in internal groove of seal sleeve (26)
2. Install rotating assembly (3, Figure 3) onto the sleeve (26), butting the holder (3E, Figure
3) up against the sleeve shoulder.
NOTE
The mechanical seal should be assembled onto the sleeve prior to installing it onto the shaft.
Using a rubber lubricant on O-ring (3B, Figure 3) will aid in the installation. Do not use grease.
Do not tighten mechanical seal setscrews (3F, Figure 3) until the sleeve (26) butts up against the
balance piston (24).
3. Insert stationary seat (1, Figure 3) w/ O-ring (2, Figure 3) into seal seat adapter (63).
Ensure anti-rotation pin in the seal seat adapter is aligned with the slot on the backside
of the stationary seal seat.
NOTE
It is recommended to clean the stationary/rotating seal faces (Fig. 3, 1 and 3A) with alcohol
using a lint-free wipe prior to installing the seal seat adapter. Use caution to avoid damage to
the stationary/rotating seal faces when installing the seal seat adapter onto the shaft sleeve.
4. Install the seal seat adapter (63), along with its associated gasket (65), onto the shaft
sleeve (26).
5. Compress mechanical seal enough to expose spiral ring groove and install spiral ring
(28) in shaft sleeve (26), locking mechanical seal (27) assembly into place.
6. Install assembled shaft sleeve (26) on power rotor (22) shaft until it rests against balance
piston (27). Use caution when installing shaft sleeve (16) to avoid damage to installed O-
ring (25). Tighten setscrews (3F, figure 3).
7. Install inner spacer (29) and outer spacer (30) on power rotor (22) shaft. Align outer
spacer (30) so openings correspond to drain hole and slots in end cover (13).
8. Slide ball bearing (31) on power rotor (22) shaft.
NOTE
Ball bearing (31) can be heated to 200° F for ease of installation on power rotor (22) shaft.
Bearing must be cooled prior to installing the power rotor into the pump.
9. Apply a thin coat of anti-seize to the power rotor threads.
10. Thread nut (32) on power rotor (22) and tighten to a torque specification of 600 + 20 lbs.
ft. (Size 400: 450 + 20 lbs. ft.)To prevent the power rotor from rotating, hold rotor with a
spanner wrench fastened to the rotor’s key slot. An extension bar may be required to
provide sufficient resistance. Remove any burrs from the key slot after nut (32) is
installed.

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11. Thread nut (33) on power rotor (22) shaft. Tighten nut to good engineering practices
(Critical torque is applied to setscrews (75)). Install set screws (75) in nut (33) and
tighten set screws to 12 + 2 lbs. ft. (Size 400: 80 + 5 lbs. in.)
12. Install assembled power rotor into the pump, ensuring that each part is centered as it
enters the inboard cover (13) and is properly seated. Ensure that the gasket (65) is
seated evenly in the inboard cover (13).
13. Install bearing retainer (34) using bolts (35) and lockwashers (36). Tighten bolts (35) to
a torque value of 95 + 5 lbs. ft. (Size 400: same as size 462)
14. Install key (54), coupling hub, and coupling nut (55). Tighten setscrew (56).
15. Install coupling spacer.
PUMP DISASSEMBLY
CAUTION
ATTENTION
The 8L series pumps incorporate highly finished precision parts that must be handled carefully
to avoid damage to critical machined surfaces. The parts removed should be tagged for
identification and their exact positions in the pump carefully noted so that the new parts, or the
same parts, are properly replaced without damage.
NOTE
Because of the size and weight of the individual parts, we recommend removing the pump from
its baseplate to a location equipped with a crane when a full disassembly is required.
1. Complete mechanical seal disassembly (Steps 1-18).
2. Remove power rotor (22) from the pump (Approximate weight: Size 400: 117 lbs., Size
462: 166 lbs.)
3. Install a 3/4"-10 eyebolt (2) into the tapped hole on the inboard cover (13). Connect a
lifting hook to the eyebolt for support of the cover. (Approximate weigh: Size 400: 231
lbs., Size 462: 330 lbs.)
4. Remove inboard cover capscrews (21) and lockwashers (20).
5. Install ½”-13 jacking bolts in the jacking bolt holes on the inboard cover (13) and evenly
torque to separate the inboard cover from the pump case.
6. Using a soft face mallet, tap the inboard cover (13) to loosen it from the case and
remove. Set inboard cover (13) on a work bench and remove balance piston
bushing/idler stop assembly. Remove capscrew (18), idler stop (16), and balance piston
bushing (15).
7. Remove O-ring (4) from the cover and O- ring (12) from pump case.
8. Remove stop pin plug (11) with O-ring (10). Insert 3/8-16 inch bolt in threaded hole of
stop pin (009) and remove.
9. Remove strainer (92) from the discharge housing (3).

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10. Remove inlet head (37). Using a sling or eyebolts and nuts support the weight of the
inlet head, then remove bolts (21) and washers (20) (size 400: 39 and 38, respectively).
11. Install strongback assembly on the suction side of the pump case (1). This consist of
the following: strongback, blank, allthread, nuts, and hardened washers (size dependent
on pump; see special tools). A blank is required to ensure even compression occurs to
the face of the housing.
a) Install applicable allthread (see Special Tooling; Housing Removal) into the
suction side pump case bolt holes 180° apart. (location of bolts 21 or 39)
b) Install housing strongback, sliding the allthread thru the slots in the stongback.
c) Install nuts and hardened washers on the back side of the allthread leaving a 1”
gap between the strongback and the housing.
d) Install 1”-8 allthread into the strongback and tighten to secure a metal blank
against the suction housing.
e) Install 1” jam nuts on the open end of the strongback allthread.
CAUTION
ATTENTION
The suction and discharge housings are not bolted together and will separate. Please use
caution when removing.
f) Push the housing out of the discharge end by rotating the outboard jam nut.
g) As the discharge housing emerges support the weight using a sling.
h) After the discharge housing is removed, remove vent pins (8), balance tube (87),
and O-rings (4 and 82).
i) Remove the suction housing(5).
j) (GLH8L-400) Remove retaining ring (7) from the pump case.
PUMP ASSEMBLY
1. (GLH8L-400) Install retaining ring (7) into the pump case (1).
2. Install O-rings (82) in grooves of oil balance tube (87).
3. Install vent pins (8), oil balance tube (87), O-ring (4), and strainer sub-assembly(92) in
discharge housing (3).
NOTE
Either the inlet housing (5) or discharge housing (3) must be placed partly in the suction side or
the discharge side of the pump case (1) (size 400 – housing must be installed from the
discharge side) prior to meshing them together and installing the anti-rotation pin (9).
4. Assemble inlet housing (5) and discharge housing (3) together ensuring vent pins (8), oil
balance tube (87) and housing openings mesh together.
5. Ensure slot in the discharge housing (3) flange aligns with stop-pin hole in the case (1).
Install housing stop pin (9). Install O-ring (10) on plug (11) and thread plug into anti-
rotation pin opening.

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CAUTION
ATTENTION
Prior to inboard cover assembly, ensure the orifice (14) (size 400: orifice (100)) is not clogged.
Flow through this orifice provides additional flow to the mechanical seal faces for cooling.
6. Install bushing (15) into bore of inboard cover (13). Install idler stop (16) on inboard
cover (13) ensuring that spring pin engages slot in the installed bushing. The idler stops
should be in alignment with the projected idlers positioning (i.e. perpendicular to the ¾”-
10 tapped hole on top of the inboard cover). Install capscrews (18), and tighten
capscrews to a torque value of 27 + 2 lbs. ft. (Size 400: 20 + 2 lbs. ft.)
7. Install O-ring (12) on the discharge side of the case.
8. Install O-ring (4) onto the inboard cover
9. Install eyebolt (2) in ¾” tapped bore in inboard cover (13) to support weight during
assembly. Install inboard cover (13) on case (1), using caution to avoid damage to O-ring
(12)and ensuring that stop subassembly is properly positioned with idler rotor bores of
housing (3). Install capscrews (21) and lockwashers (20). Tighten capscrews (21) to a
torque value of 340± 15 lbs. ft. (Size 400: 220 + 15 lbs. ft.).
10. Install the power rotor assembly into the inboard cover end of the pump.
11. Using the power rotor strongback secure the power rotor in position in preparation for
the mechanical seal/bearing installation. (see step 22 of disassembly for power rotor
strongback installation; blank should be only the size of the power rotor for this step.)
12. Complete Steps 1-15 of Servicing the Mechanical Seal and Bearing - Mechanical Seal
and Bearing Installation.
13. Remove power rotor strong back.
14. Install O-ring (12) on the suction side of the case.
15. Install inlet head (37) to case (1) using capscrews (21) and lockwashers (20) (size 400:
39 and 38, respectively). Torque capscrews to 340 ± 15 lbs. ft. (Size 400: 215 + 15 lbs.
ft.).
16. Install idler rotors (40), tapered end first, into inlet end of housing (5). Mesh threads of
idler rotors (40) with installed power rotor (22) and rotate power rotor (22) by hand to
draw idlers into proper position. Install idler rotors (41) into inlet end of rotor housing (5).
Mesh threads of idler rotors (41) with threads of power rotor (22), and rotate power rotor
(22) by hand to draw idlers into proper position.
17. Slide idler balance piston housings (44) onto end of idler rotors (41).
18. Install O-rings (82) into grooves of oil balance tube (81) and insert oil balance tube (81) into
rotor housing (5).
19. Insert capscrews (61) into plate (48). Slide spacers (88) onto capscrews (61). Mount
plate (48) onto rotor housing (5), ensuring the oil balance tube (81) is aligned with the
slot in the plate (48). Torque capscrews (61) to 73 ± 5 lbs. ft. (Size 400: same as size
462)
20. Place O-ring (12) in groove of cover (50). Mount cover (50) to inlet head (37) using
capscrews (51). Torque capscrews (51) to 193 ± 10 lbs. ft. (Size 400: 215 + 15 lbs. ft.)
21. Install tubing (53) to elbow fittings (52). Install drain plug (19) in cover (50).

18
PARTS LIST
GLH8L-462 PART LIST
IDP
Part Description
Qty
Kit
IDP
Part Description
Qty
Kit
1
Pump Case
1
33
Check Nut
1
XX
2
Eyebolt
2
34
Bearing Retainer
1
3
Housing
1
XX
35
Hex Bolt
8
4
O-ring
2
X
36
Lock Washer
8
5
Housing
1
XX
37
Inlet Head
1
8
Vent Pin
2
XX
40
Idler
2
XX
9
Stop Pin
1
41
Idler
2
XX
10
O-ring
1
X
44
Idler Balance Piston
Housing
2
XX
11
Plug
1
48
Plate
1
XX
12
O-ring
3
X
50
Cover
1
13
Inboard Cover
1
51
Flange Screw
12
14
Pipe Plug
4
52
Elbow Fitting
2
15
Bushing
1
XX
53
Tube
1
16
Idler Stop Subassembly
1
XX
54
Key
1
18
Capscrew
2
XX
55
Nut
1
19
Pipe Plug
5
56
Setscrew
1
20
Lockwasher
24
57
Outlet Adapter
1
21
Flange Screw
24
58
Gasket
1
X
22
Power Rotor
1
XX
59
Hex Bolt
4
23
O-ring*
1
X
61
Capscrew
4
24
Balance Piston
1
XX
63
Seal Seat Adapter
1
25
O-ring
1
X
65
Gasket
1
X
26
Seal Sleeve
1
69
O-Ring*
1
X
27
Mechanical Seal
1
X
75
Set Screw
2
XX
28
Spiral Ring
1
X
81
Oil Balance Tube
1
29
Inner Spacer
1
82
O-Ring
4
X
30
Outer Spacer
1
87
Oil Balance Tube
1
XX
31
Bearing
1
X
88
Spacer
4
32
Check Nut
1
92
Strainer Sub-
assembly
1
XX
X Denotes Minor Repair Kit Items
XX Denotes Major Repair Kit Items
(Note: Minor Repair Kit Items are included in the Major Repair Kit)
*Pump will have either O-ring (25) or O-ring (69) depending on seal type.

19
GLH8L-400 PART LIST
IDP
Part Description
Qty
Kit
IDP
Part Description
Qty
Kit
1
Pump Case
1
34
Bearing Retainer
1
2
Eyebolt
2
35
Hex Bolt
8
3
Housing
1
XX
36
Lock Washer
8
4
O-ring
2
X
37
Inlet Head
1
5
Housing
1
XX
38
Flange Screw
8
6
Spacer
1
39
Lock Washer
8
7
Retaining Ring
2
40
Idler
2
XX
8
Vent Pin
2
XX
41
Idler
2
XX
9
Stop Pin
1
44
Idler Balance Piston
Housing
1
XX
10
O-ring
1
X
48
Plate
1
XX
11
Plug
1
50
Cover
1
12
O-ring
3
X
51
Hex Bolt
8
13
Inboard Cover
1
52
Elbow Fitting
2
14
Pipe Plug
4
53
Tube
1
15
Bushing
1
XX
54
Key
1
16
Idler Stop Subassembly
1
XX
55
Nut
1
18
Capscrew
2
XX
56
Setscrew
1
19
Pipe Plug
5
57
Outlet Adapter
1
20
Lockwasher
8
58
Gasket
1
X
21
Flange Screw
8
59
Hex Bolt
4
22
Power Rotor
1
XX
61
Capscrew
4
23
O-ring*
1
X
63
Seal Seat Adapter
1
24
Balance Piston
1
XX
65
Gasket
1
X
25
O-ring
1
X
75
Set Screw
2
XX
26
Seal Sleeve
1
81
Oil Balance Tube
1
27
Mechanical Seal
1
X
82
O-Ring
4
X
28
Spiral Ring
1
X
87
Oil Balance Tube
1
XX
29
Inner Spacer
1
88
Spacer
4
30
Outer Spacer
1
90
Plug
1
31
Bearing
1
X
91
O-ring
1
32
Check Nut
1
92
Strainer Sub-
assembly
1
XX
33
Check Nut
1
XX
XDenotes Minor Repair Kit Items
XX Denotes Major Repair Kit Items
(Note: Minor Repair Kit Items are included in the Major Repair Kit)

20
DRAWINGS