diff --git a/dvc/commands/experiments/pull.py b/dvc/commands/experiments/pull.py
index 98acc40ec..3fab2d75b 100644
--- a/dvc/commands/experiments/pull.py
+++ b/dvc/commands/experiments/pull.py
@@ -3,23 +3,13 @@ import logging
 
 from dvc.cli.command import CmdBase
 from dvc.cli.utils import append_doc_link
-from dvc.exceptions import InvalidArgumentError
 from dvc.ui import ui
 
 logger = logging.getLogger(__name__)
 
 
 class CmdExperimentsPull(CmdBase):
-    def raise_error_if_all_disabled(self):
-        if not any([self.args.experiment, self.args.all_commits, self.args.rev]):
-            raise InvalidArgumentError(
-                "Either provide an `experiment` argument, or use the "
-                "`--rev` or `--all-commits` flag."
-            )
-
     def run(self):
-        self.raise_error_if_all_disabled()
-
         pulled_exps = self.repo.experiments.pull(
             self.args.git_remote,
             self.args.experiment,
diff --git a/dvc/commands/experiments/push.py b/dvc/commands/experiments/push.py
index fdd3834ca..298271046 100644
--- a/dvc/commands/experiments/push.py
+++ b/dvc/commands/experiments/push.py
@@ -5,20 +5,12 @@ from typing import Any, Dict
 from dvc.cli import completion
 from dvc.cli.command import CmdBase
 from dvc.cli.utils import append_doc_link
-from dvc.exceptions import InvalidArgumentError
 from dvc.ui import ui
 
 logger = logging.getLogger(__name__)
 
 
 class CmdExperimentsPush(CmdBase):
-    def raise_error_if_all_disabled(self):
-        if not any([self.args.experiment, self.args.all_commits, self.args.rev]):
-            raise InvalidArgumentError(
-                "Either provide an `experiment` argument, or use the "
-                "`--rev` or `--all-commits` flag."
-            )
-
     @staticmethod
     def log_result(result: Dict[str, Any], remote: str):
         from dvc.utils import humanize
@@ -59,8 +51,6 @@ class CmdExperimentsPush(CmdBase):
     def run(self):
         from dvc.repo.experiments.push import UploadError
 
-        self.raise_error_if_all_disabled()
-
         try:
             result = self.repo.experiments.push(
                 self.args.git_remote,
diff --git a/dvc/repo/experiments/pull.py b/dvc/repo/experiments/pull.py
index 2d4624c4f..50d54fdc5 100644
--- a/dvc/repo/experiments/pull.py
+++ b/dvc/repo/experiments/pull.py
@@ -32,30 +32,30 @@ def pull(  # noqa: C901
     exp_ref_set: Set["ExpRefInfo"] = set()
     if all_commits:
         exp_ref_set.update(exp_refs(repo.scm, git_remote))
+    elif exp_names:
+        if isinstance(exp_names, str):
+            exp_names = [exp_names]
+        exp_ref_dict = resolve_name(repo.scm, exp_names, git_remote)
+
+        unresolved_exp_names = []
+        for exp_name, exp_ref in exp_ref_dict.items():
+            if exp_ref is None:
+                unresolved_exp_names.append(exp_name)
+            else:
+                exp_ref_set.add(exp_ref)
+
+        if unresolved_exp_names:
+            raise UnresolvedExpNamesError(unresolved_exp_names)
+
     else:
-        if exp_names:
-            if isinstance(exp_names, str):
-                exp_names = [exp_names]
-            exp_ref_dict = resolve_name(repo.scm, exp_names, git_remote)
-
-            unresolved_exp_names = []
-            for exp_name, exp_ref in exp_ref_dict.items():
-                if exp_ref is None:
-                    unresolved_exp_names.append(exp_name)
-                else:
-                    exp_ref_set.add(exp_ref)
-
-            if unresolved_exp_names:
-                raise UnresolvedExpNamesError(unresolved_exp_names)
-
-        if rev:
-            if isinstance(rev, str):
-                rev = [rev]
-            rev_dict = iter_revs(repo.scm, rev, num)
-            rev_set = set(rev_dict.keys())
-            ref_info_dict = exp_refs_by_baseline(repo.scm, rev_set, git_remote)
-            for _, ref_info_list in ref_info_dict.items():
-                exp_ref_set.update(ref_info_list)
+        rev = rev or "HEAD"
+        if isinstance(rev, str):
+            rev = [rev]
+        rev_dict = iter_revs(repo.scm, rev, num)
+        rev_set = set(rev_dict.keys())
+        ref_info_dict = exp_refs_by_baseline(repo.scm, rev_set, git_remote)
+        for _, ref_info_list in ref_info_dict.items():
+            exp_ref_set.update(ref_info_list)
 
     pull_result = _pull(repo, git_remote, exp_ref_set, force)
 
diff --git a/dvc/repo/experiments/push.py b/dvc/repo/experiments/push.py
index 545c4e671..81c6ed473 100644
--- a/dvc/repo/experiments/push.py
+++ b/dvc/repo/experiments/push.py
@@ -111,7 +111,8 @@ def push(
         exp_ref_set.update(exp_refs(repo.scm))
     if exp_names:
         exp_ref_set.update(exp_refs_from_names(repo.scm, ensure_list(exp_names)))
-    if rev:
+    else:
+        rev = rev or "HEAD"
         if isinstance(rev, str):
             rev = [rev]
         exp_ref_set.update(exp_refs_from_rev(repo.scm, rev, num=num))